UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
Form 10-K/A
(Amendment No.1)

10-K
(Mark One)
 þ
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 20172018
or
 ¨TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission file number 1-12691
ION Geophysical Corporation
(Exact Name of Registrant as Specified in Its Charter)
Delaware 22-2286646
(State or Other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Identification No.)
2105 CityWest Blvd
Suite 100
Houston, Texas 77042-2839
(Address of Principal Executive Offices, Including Zip Code)
(281) 933-3339
(Registrant’s Telephone Number, Including Area Code)
Securities registered pursuant to Section 12(b) of the Act:
Title of Each Class Name of Each Exchange on Which Registered
Common Stock, $0.01 par value New York Stock Exchange
Securities registered pursuant to Section 12(g) of the Act:
None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes ¨ No þ
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act Yes ¨ No þ
Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes þ  No ¨
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No ¨
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): 



        


Large accelerated filer o Accelerated filerox
      
Non-accelerated filer 
o(Do not check if a smaller reporting company)
 Smaller reporting companyýo
      
    Emerging growth companyo
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ¨ No þ
As of June 30, 20172018 (the last business day of the registrant’s second quarter of fiscal 2017)2018), the aggregate market value of the registrant’s common stock held by non-affiliates of the registrant was $45.3$260.0 million based on the closing sale price per share ($4.35)24.30) on such dateJune 29, 2018 as reported on the New York Stock Exchange.
As of February 6, 2018,4, 2019, the number of shares of common stock, $0.01 par value, outstanding was 12,022,20114,015,615 shares.

DOCUMENTS INCORPORATED BY REFERENCE
Document Parts Into Which Incorporated
Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders scheduled to be held on May 17, 2018,15, 2019, to be filed pursuant to Regulation 14A Part III


        

EXPLANATORY NOTETABLE OF CONTENTS
Page
PART I
Item 1.Business
Item 1A.Risk Factors
Item 1B.Unresolved Staff Comments
Item 2.Properties
Item 3.Legal Proceedings
Item 4.Mine Safety Disclosures
PART II
Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Item 6.Selected Financial Data
Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations
Item 7A.Quantitative and Qualitative Disclosures about Market Risk
Item 8.Financial Statements and Supplementary Data
Item 9.Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Item 9A.Controls and Procedures
Item 9B.Other Information
PART III
Item 10.Directors, Executive Officers and Corporate Governance
Item 11.Executive Compensation
Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Item 13.Certain Relationships and Related Transactions, and Director Independence
Item 14.Principal Accounting Fees and Services
PART IV
Item 15.Exhibits and Financial Statement Schedules
Signatures
Index to Consolidated Financial Statements

PART I
Preliminary Note: This Annual Report on Form 10-K contains “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements should be read in conjunction with the cautionary statements and other important factors included in this Form 10-K. See Item 1A. “Risk Factors”for a description of important factors which could cause actual results to differ materially from those contained in the forward-looking statements.
In this Form 10-K, “ION Geophysical,” “ION,” “the company” (or, “the Company”), “we,” “our,” “ours” and “us” refer to ION Geophysical Corporation and its consolidated subsidiaries, except where the context otherwise requires or as otherwise indicated. Certain trademarks, service marks and registered marks of ION referred to in this Form 10-K are defined in Item 1. “Business — Intellectual Property.”

Item 1. Business
We have been a technology leader for 50 years with a strong history of innovation. While the traditional focus of our cutting-edge technology has been on the exploration and production (“E&P”) industry, we are now broadening and diversifying our business into relevant adjacent markets such as offshore logistics, military and marine robotics.
Leveraging innovative technologies, we create value through data capture, analysis and optimization to enhance companies’ critical decision-making abilities and returns. Our E&P offerings are focused on improving decision-making, enhancing reservoir management and optimizing offshore operations. They are designed to allow oil and gas companies to obtain higher resolution images of the Earth’s subsurface to reduce their risk in hydrocarbon exploration and development. We acquire, process and interpret seismic data from seismic surveys on a multi-client or proprietary basis. Seismic surveys for our multi-client data library business are pre-funded, or underwritten, in part by our customers, and we contract with third party seismic data acquisition companies to acquire the seismic data, all of which is intended to minimize our risk exposure. We serve customers in most major energy producing regions of the world from strategically located offices in 21 cities on six continents.
Seismic imaging plays a fundamental role in hydrocarbon exploration and reservoir development by delineating structures, rock types and fluid locations in the subsurface. Our technologies, services and solutions are used by E&P companies to generate high-resolution images of the Earth’s subsurface to identify hydrocarbons and pinpoint drilling locations for wells and to monitor production from existing wells.
We provide our services and products through three business segments - E&P Technology & Services, Operations Optimization (formerly referred to as E&P Operations Optimization), and Ocean Bottom Integrated Technologies (formerly referred to as Ocean Bottom Seismic Services). In addition, we have a 49% ownership interest in our INOVA Geophysical Equipment Limited joint venture (“INOVA Geophysical,” or “INOVA”).
The advanced technologies we currently offer include our Orca® and Gator™ command and control software systems, Full Waveform Inversion (“FWI”) data processing technology, our OBS acquisition systems, and other technologies, each of which is designed to deliver improvements in image quality, safety and/or productivity. In 2015, we introduced Marlin™ to optimize operations offshore. In 2017, we introduced our new fully integrated nodal system, 4Sea™which is designed to deliver a step change in economics, QHSE performance and final image delivery time, creating more value for clients by providing data in time for critical reservoir decision, such as determining drilling locations and informing enhanced recovery techniques.
We have approximately 500 patents and pending patent applications in various countries around the world. Approximately 42% of our employees are involved in technical roles and over 21% of our employees have advanced degrees.
E&P Technology & Services. Our E&P Technology & Services business provides three distinct service activities that often work together.
Our E&P Technology & Services creates digital data assets and delivers services to help E&P companies improve decision-making, reduce risk and maximize value. For example, E&P Technology & Services provides information to better understand new frontiers or complex subsurface geologies, how to maximize portfolio value, or how to optimize license round success and acreage values.
Our Ventures group leverages the world-class geoscience skills of both the Imaging Services and E&P Advisors groups to create global digital data assets that are licensed to multiple E&P companies to optimize their investment decisions. Our global data library consists of over 614,000 km of 2-D and over 224,000 sq. km of 3-D multi-client seismic data in virtually all major offshore petroleum provinces. Ventures provides services to manage multi-client or proprietary surveys, from survey planning and design to data acquisition and management, to final subsurface imaging and reservoir characterization. We focus on the technologically intensive components of the image development process, such as survey planning and design, and data

processing and interpretation, while outsourcing asset-intensive components (such as field acquisition) to experienced contractors.
Our Imaging Services group offers data processing and imaging services designed to maximize image quality, helping E&P companies reduce exploration and production risk, evaluate and develop reservoirs, and increase production. Imaging Services develops subsurface images by applying its processing technology to data owned or licensed by its customers. We maintain approximately 19 petabytes of digital seismic data storage in four global data centers, including two core data centers located in Houston and in the U.K.
Our E&P Advisors’ strategy is to provide technical, commercial and strategic advice to host governments, E&P companies and private equity firms to evaluate and market oil and gas opportunities and/or assets worldwide, sharing in the value we create.
Operations Optimization. Our Operations Optimization segment develops mission-critical subscription offerings and provides engineering services that enable operational control and optimization offshore. This segment is comprised of our Optimization Software & Services and Devices offerings.
Our Optimization Software & Services group provides survey design and command and control software systems and related services for marine towed streamer and seabed operations. Our Orca software is installed on towed streamer marine vessels worldwide, and our Gator software is used by seabed crews. Our latest offering, Marlin is used to optimize offshore operations.
Our Devices group is engaged in the manufacture and repair of marine towed streamer positioning and control systems, analog geophone sensors and compasses which have been deployed in marine robotics, scientific, E&P and other commercial applications.
Ocean Bottom Integrated Technologies. Higher quality data can be acquired from the sea floor compared to the traditional method of acquiring it near the surface, which enables companies to have a better image and better understanding of the subsurface to make optimal reservoir decisions. ION provides a full suite of technology and services that includes survey design, planning, acquisition, data processing, interpretation and reservoir services to optimize image quality, operational efficiency and safety. ION’s Ocean Bottom Integrated Technologies group integrates a variety of ION’s advanced technologies to accelerate Ocean Bottom Seismic (“OBS”) data capture and delivery for our clients’ enhanced reservoir decision-making, and improved returns.
Our team develops re-deployable ocean bottom data acquisition technology. In 2017, we introduced 4Sea, our new fully integrated ocean bottom system. 4Sea is differentiated in its ability to deliver a step change in economics, QHSE performance and final image delivery time, creating more value for the client by providing information in time for critical decisions, such as determining drilling locations, fluid injections, and the like.
We have continued to evolve our strategy for our Ocean Bottom Integrated Technologies segment consistent with our asset light business model. The remaining elements of our next generation ocean bottom nodal system, 4Sea, will be commercialized in 2019. We are offering 4Sea components more broadly to the growing number of OBS service providers under recurring revenue commercial strategies that will enable us to share in the value our technology delivers. We may also license the right to manufacture and use the fully integrated system to a service provider on a value-based pricing model, such as a royalty stream. Such licensing would be recognized through the relevant segment, either E&P Technology & Services or Operations Optimization. While not our primary route to market, we continue to evaluate acquisition projects on a case-by-case basis that meet our long-term risk and return thresholds.
INOVA Geophysical. We conduct our land seismic equipment business through INOVA Geophysical, a joint venture with BGP Inc., a subsidiary of China National Petroleum Corporation (“CNPC”). BGP is generally regarded as the world’s largest land geophysical service contractor. BGP owns a 51% equity interest in INOVA Geophysical, and we own the remaining 49% interest. INOVA manufactures land seismic data acquisition systems, digital sensors, vibroseis vehicles (i.e., vibrator trucks), and energy source controllers. We wrote our investment in INOVA down to zero as of December 31, 2014.
Seismic Industry Overview
1930s – 1970s. Since the 1930s, oil and gas companies have sought to reduce exploration risk by using seismic data to create an image of the Earth’s subsurface. Seismic data is recorded when listening devices placed on the Earth’s surface, ocean bottom floor, or carried within the streamer cable of a towed streamer vessel, measure how long it takes for sound vibrations to echo off rock layers underground. For seismic data acquisition onshore, the acoustic energy producing the sound vibrations is generated by the detonation of small explosive charges or by large vibroseis (vibrator) vehicles. In marine acquisition, the energy is provided by a series of source arrays that deliver compressed air into the water column.

The acoustic energy propagates through the subsurface as a spherical wave front, or seismic wave. Interfaces between different types of rocks will both reflect and transmit this wave front. Onshore, the reflected signals return to the surface where they are measured by sensitive receivers that are analog coil-spring geophones. Offshore, the reflected signals are recorded by either hydrophones towed in an array behind a streamer acquisition vessel or by multicomponent geophones or MEMS sensors that are placed directly on the ocean floor. Once the recorded seismic energy is processed using advanced algorithms and workflows, images of the subsurface can be created to depict the structure, lithology (rock type), fracture patterns, and fluid content of subsurface horizons, highlighting the most promising places to drill for oil and natural gas. This processing also aids in engineering decisions, such as drilling and completion methods, as well as decisions affecting overall reservoir production and economic decisions relating to drilling risk and reserves in place.
Typically, an E&P company engages the services of a geophysical acquisition contractor to develop a seismic survey design, secure permits, coordinate logistics, and acquire seismic data in a selected area. The E&P company generally relies on third parties, such as ION, to provide the contractor with equipment, navigation and data management software, and field support services necessary for data acquisition. After the data is collected, the same geophysical contractor, a third-party data processing company, or the E&P company itself will process the data using proprietary algorithms and workflows to create a series of seismic images. Geoscientists then interpret the data by reviewing the images of the subsurface and integrating the geophysical data with other geological and production information such as well logs or core information.
During the 1960s, digital seismic data acquisition systems (which converted the analog output from the geophones into digital data for recording) and computers for seismic data processing were introduced. Using the new systems and computers, the signals could be recorded on magnetic tape and sent to data processors where they could be adjusted and corrected for known distortions. The final processed data was displayed in a form known as “stacked” data. Computer filing, storage, database management, and algorithms used to process the raw data quickly grew more sophisticated, dramatically increasing the amount of subsurface seismic information.
1980s. Until the early 1980s, the primary commercial seismic imaging technology was 2-Dimension (“2-D”). 2-D seismic data is recorded using a single line of receivers. Once processed, 2-D seismic data allows geoscientists to see only a thin vertical slice of the Earth, and that image may be distorted by reflections originating out of the place of the receiver line. A geoscientist using 2-D seismic technology must speculate on the characteristics of the Earth between the slices and attempt to visualize the true 3-Dimension (“3-D”) structure of the subsurface.
The commercial development of 3-D imaging technology in the early 1980s was an important technological milestone for the seismic industry. Previously, the high cost of 3-D seismic data acquisition techniques and the lack of computing power necessary to process, display, and interpret 3-D data on a commercial basis slowed its widespread adoption. Today’s 3-D seismic techniques record the reflected energy across a patch of receivers that collectively provide a more holistic, spatially-sampled depiction of geological horizons and, in some cases, rock and fluid properties, within the Earth.
3-D seismic data and the associated computer-based processing platforms enable geoscientists to generate more accurate subsurface maps than could be constructed from 2-D seismic lines. In particular, 3-D seismic data provided more detailed information about and higher-quality images of subsurface structures, including the geometry of bedding layers, salt structures, and fault planes. The improved 3-D seismic images enabled the oil and gas industry to discover new reservoirs, reduce finding and development costs, and lower overall hydrocarbon exploration risk. Driven by faster computers and more sophisticated mathematical equations to process the data, the technology advanced quickly.
1990s. As commodity prices decreased in the late 1990s and the pace of innovation in 3-D seismic imaging technology slowed, E&P companies slowed the commissioning of new seismic surveys. Also, business practices employed by geophysical contractors impacted demand for seismic data. In an effort to sustain higher utilization of existing capital assets, geophysical contractors increasingly began to collect speculative seismic data for their own data libraries in the hopes of selling it later to E&P companies. There became an abundance of speculative multi-client data in many regions. Additionally, since contractors incurred most of the costs of this Amendment No. 1speculative seismic data at the time of acquisition, contractors lowered prices to recover as much of their investment as possible, which drove operating margins down. During the 1990’s, the accuracy of 3-D seismic surveys improved to the point that a survey acquired after significant oil production could be compared to a pre-production survey, and a map of the drainage pattern of the reservoir could be produced. This technique became known as time lapse, or 4-D seismic.
2000s. The conditions from the 1990s continued to prevail until 2004-2005, when commodity prices began increasing and E&P companies increased capital spending programs, driving higher demand for our services and products. During this time, the use of horizontal drilling and hydraulic fracturing increased, as onshore North American production became economically viable with higher oil prices. These techniques, used to extract oil from and gas from unconventional reservoirs, made once “hard to produce” oil and gas accessible and caused an upsurge in North American onshore oil and gas activity. An increased use of the 4-D seismic technology has been noted during the 2000s where its value in reservoir management, increasing reserves, upping recovery and optimizing infill well locations has been established.

The financial crisis that occurred in 2008 and the resulting economic downturn drove hydrocarbon prices down sharply, reducing exploration activities in North America and in many parts of the world. However, crude oil prices rebounded and were fairly consistent from 2011-2014 exceeding $100 per barrel, and U.S. oil production exceeded even the most optimistic forecasts. In late 2014, however, oil prices began to decline significantly, dropping by approximately half and continued into 2015 and 2016 as signs emerged that non-U.S. demand was weakening.
During 2017 and 2018, crude oil prices rebounded resulting from sustained production cut by Organization of the Petroleum Exporting Countries (“OPEC”) that reduced the overall crude supply. In late 2018, crude oil prices began to decline again due to slower than expected pace of global demand growth and record level crude oil production growth. Since 2015, Oil companies have prioritized shareholder returns and cash flow generation over hydrocarbon resource growth, reducing discretionary spending and shifting their focus from exploration to production. This shift caused a contraction in E&P spending, especially on Form 10-K/seismic data and services for exploration. In addition, E&P companies have tended to shift toward reprocessing existing seismic data as a more cost-effective alternative to acquiring new data where possible.
Our Strategy
The key elements of our business strategy are to:
Leverage our key technologies to create value through data capture, analysis and optimization to enhance companies’ critical decision-making abilities and returns. Decisions today are increasingly complex with huge amounts of data to comprehend. Companies capable of translating raw data into actionable insights gain a competitive edge and deliver superior returns. ION offerings are focused on improving E&P decision-making, enhancing reservoir management and optimizing offshore operations. E&P Technology & Services creates digital data assets and delivers services that improve decision-making, mitigate risk and maximize portfolio value for E&P companies, such as our multi-client programs that are licensed to multiple E&P companies to optimize their investment decisions. Operations Optimization develops mission-critical subscription offerings and engineering services that enable operational control and optimization offshore. Ocean Bottom Integrated Technologies integrates a variety of ION’s advanced technologies to accelerate data capture and delivery. This information enables E&P companies to enhance their reservoir decision-making and improve their returns.
Expand and globalize our E&P Technology & Services business. We seek to expand and grow our E&P Technology & Services business into new regions, with new customers and new offerings, including data processing services through our Imaging Services group and our Ventures multi-client and proprietary programs. Historically known for our 2-D programs, we entered the 3-D multi-client market in 2014 by acquiring and processing our first survey offshore Ireland. Since then, we have expanded our 3-D seismic data library considerably by purchasing existing seismic data and reimaging the data by using new data processing techniques and algorithms, such as our advanced FWI. For the foreseeable future, we expect to continue investing in research and development and computing infrastructure for our data processing business and to support our multi-client projects. We believe this focus better positions our company as a full-service technology company with an increasing proportion of revenues derived from E&P customers. In 2018, E&P companies accounted for approximately 77% of our total consolidated net revenues.
Continue investing in advanced software and equipment technology to provide next generation services and products. We intend to continue investing in the development of new technologies for use by E&P companies. In particular, we intend to focus on the development of our next generation OBS technology, our Marlin operations optimization software, and derivative products and continued advancement of our FWI and ocean bottom nodal algorithms, with the goal of obtaining technical and market leadership in what we continue to believe are important and expanding markets. In 2018, our total investment in research and development and engineering was equal to approximately 10% of our total consolidated net revenues for the year.
Collaborate with our customers to provide products and solutions designed to meet their needs. A key element of our business strategy has been to understand the challenges faced by E&P companies in seismic survey planning, data acquisition, processing, and interpretation. We will continue to develop and offer technology and services that enable us to work with E&P companies to solve their unique challenges around the world. We have found collaborating with E&P companies to better understand their imaging challenges and working with them to ensure the right technologies are properly applied, is the most effective method for meeting their needs. Helping solve the most difficult challenges for our customers is an important element of our long-term business strategy, and we are implementing this partnership approach globally through local personnel in our regional organizations who understand the unique challenges in their areas. We formed an E&P Advisors group in 2015 designed to focus specifically on this element of our strategy.

Expand our Operations Optimization business into relevant adjacent markets.  While our traditional focus for technology has been on the E&P industry, we are broadening and diversifying our software and equipment businesses into relevant adjacent markets such as offshore logistics, military and marine robotics.  Adjacent markets broaden our opportunity to better monetize our return on technology investments while reducing our susceptibility to E&P cycles. We intend to derive a significant portion of revenues from these non-E&P markets over the next 5 years.
Our Strengths
We believe that we are solidly positioned to successfully execute the key elements of our business strategy based on the following competitive strengths:
We leverage our innovative technologies to create value through data capture, analysis and optimization to enhance companies’ critical decision-making abilities and returns. Our cutting-edge data management and analysis platforms help derive insights from data we acquire to improve E&P decision-making, enhance reservoir management and optimize offshore operations.  The data can be used to decide whether and how much to bid on a block, how to maximize production from a field, or how to optimize the safety and efficiency of complex maritime projects.  Our operations optimization platform and imaging engine are the core underlying technology and we continually advance our complex algorithms to improve the resulting analysis.
We focus on higher potential return offerings and creative business models to maximize shareholder value. We streamlined our business and focused on the areas with the highest potential returns because we believe every dollar invested should go further.  In addition, we try to structure both the project financing and payment in a way to maximize profit, such as sharing in the success of a project.
Our “asset light” strategy enables us to avoid significant fixed costs and remain financially flexible. We do not own a fleet of marine vessels and do not provide our own crews to acquire seismic data. We outsource seismic data acquisition activity to third parties that operate fleets of seismic vessels and equipment. This practice enables us to avoid fixed costs associated with these assets and personnel and to manage our business in a manner designed to afford us the flexibility to quickly scale up or down our capital investments based on E&P spending levels. We actively manage the costs of developing our multi-client data library business by having our customers partially pre-fund, or underwrite, the investment for any new project. Our target goal is to have a vast majority of the total cost of each new project’s data acquisition to be underwritten by our customers. We believe this conservative approach to data library investment is the most prudent way to reduce the impact of any sudden reduction in the demand for seismic data, giving us the flexibility to aggressively reduce cash outflows as we have successfully implemented in the current industry downturn.
Our global footprint and diversified portfolio approach enable us to offset regional downturns. Conducting business around the world has been and will continue to be a key component of our strategy. This global focus and diversified portfolio approach has been helpful in minimizing the impact of any regional or country-specific slowdown for short or extended periods of time.  While the traditional focus of our cutting-edge technology has been on the E&P industry, we are now broadening and diversifying our business into relevant adjacent markets such as offshore logistics, military and marine robotics.  Adjacent markets broaden our opportunity to better monetize our return on technology investments while reducing our susceptibility to E&P cycles.
We have a diversified and blue chip customer base. We provide services and products to a diverse, global customer base that includes many of the largest oil and gas and geophysical companies in the world, including National Oil Companies (“Form 10-K/A”NOCs”) and International Oil Companies (“IOCs”). Over the past decade, we have made significant progress expanding our customer list and revenue sources. Whereas almost all of our revenues in the early 2000s were derived principally from seismic service providers, in 2018, E&P companies accounted for approximately 77% of our total consolidated net revenues.
Services and Products
E&P Technology & Services Segment
Our E&P Technology & Services segment includes the following:
Ventures — Our Ventures group provides complete seismic data services, from survey planning and design through data acquisition to final subsurface imaging and reservoir characterization. We work backwards through the seismic workflow, with the final image in mind, to select the optimal survey design, acquisition technology, and processing techniques.

We offer our services to customers on both a proprietary and multi-client (non-exclusive) basis. In both cases, the customers generally pre-fund a majority of the survey costs. The period during which our multi-client surveys are being designed, acquired or processed is referred to as the “New Venture” phase. For proprietary services, the customer has exclusive ownership of the data. For multi-client surveys, we generally retain ownership of or long-term exclusive marketing rights to the data and receive ongoing revenue from subsequent data license sales.
Since 2002, we have acquired and processed a growing multi-client data library consisting of non-exclusive marine and ocean bottom data from around the world. The majority of the data licensed by ION consists of ultra-deep 2-D seismic data that E&P companies use to evaluate petroleum systems at the basin level, including insights into the character of source rocks and sediments, migration pathways, and reservoir trapping mechanisms. In some cases, we extend beyond seismic data to include magnetic, gravity, well log, and electromagnetic information, to provide a more comprehensive picture of the subsurface. Known as “BasinSPAN” programs, these geophysical surveys cover most major offshore basins worldwide and we continue to build on them. In addition to our 2-D multi-client programs, in 2013, we acquired our first 3-D marine proprietary program, then in 2014, in collaboration with Polarcus Limited, a marine geophysical company, we jointly acquired and processed our first 3-D survey offshore Ireland.
 In 2016, we began a 3-D multi-client broadband reimaging program offshore Mexico in collaboration with Schlumberger leveraging Mexico's National Hydrocarbons Commission (CNH) data library. The successful Campeche program has since expanded due to customer demand and now consists of approximately 100,000 km2 offshore southern Mexico. Since 2016, we have added an additional 216,000 km2 of 3-D data offshore Mexico and in Brazil. Our programs in Brazil make up a significant portion of our backlog at December 31, 2018.
We also have a library of 3-D onshore reservoir imaging and characterization programs that provide E&P companies with the ability to better understand unconventional reservoirs to maximize production. Known as “ResSCAN™” programs, these 3-D multicomponent seismic data programs were designed, acquired and depth-imaged using advanced geophysical technology and proprietary processing techniques, resulting in high-definition images of the subsurface.
Imaging Services — Our Imaging Services group provides advanced marine and land seismic data processing and imaging. In addition to applying processing and imaging technologies to data we own or data licensed by our customers, we also provide our customers with seismic data acquisition support services, such as data pre-conditioning for imaging and quality control of seismic data acquisition.
We utilize a globally distributed network of Linux-cluster processing centers in combination with our major hubs in Houston and London to process seismic data using advanced, proprietary algorithms and workflows.
Our Imaging Services team has pioneered several differentiated processing and imaging solutions for both offshore and onshore environments including: Reverse Time Migration (RTM), Surface Related Multiple Elimination (SRME), and WiBand broadband deghosting. In 2013, we released FWI and non-parametric picking Tomography techniques to improve subsurface image resolution in areas with complex geologies. The advantages of these techniques are that they allow for the resolution of complex, small-scale velocity variations. We continue to research and develop processing and imaging technologies for commercial application, including our latest developments in Reflection FWI and Least Squares RTM. In addition to improving our algorithms, we also continue to optimize the efficiency of our proprietary software, Perseus, such that we can turnaround larger projects faster, e.g. a 42,000 km2 fast track product in the Northern Campeche Basin in Mexico in just 6 weeks.  Our continued investment in hardware infrastructure complements these research and development efforts, ensuring faster turnaround time and less expensive computational costs for clients, whether they are seeking 2-D, 3-D, proprietary, multi-client, towed streamer or seabed solutions.
At December 31, 2018, our E&P Technology & Services segment backlog, which consists of commitments for (i) data processing work and (ii) both multi-client New Venture and proprietary projects that have been underwritten, had decreased to $21.9 million compared with $39.2 million at December 31, 2017. The decrease in backlog is attributable to the timing of finalizing contracts. Our E&P Technology & Services segment’s fiscal year-end backlog includes signed contracts that we can usually fulfill within approximately six months. Investments in our multi-client data library are dependent upon the timing of our New Venture projects and the availability of underwriting by our customers. Our asset light strategy enables us to scale our business to avoid significant fixed costs and to remain financially flexible as we manage the timing and levels of our capital expenditures.
E&P Advisors Our E&P Advisors group partners with E&P operators, energy industry regulators and capital institutions to capture and monetize E&P opportunities worldwide. This group provides technical, commercial and strategic advice across the exploration and production value chain, working at basin, prospect and field scales. E&P Advisors couples ION’s proven technical capabilities with the industry’s best commercial and strategic minds to deliver fit-for-purpose solutions, employing a variety of commercial models specific to our clients’ needs.
Operations Optimization Segment

Our Operations Optimization segment combines our Optimization Software & Services and Devices offerings.
Through this segment, we supply command and control software systems and related services for marine towed streamer and ocean bottom seismic operations. Software developed by our Optimizations Software & Services group is installed on marine towed streamer vessels and used by many ocean bottom survey crews. In addition, we recently began selling existing technology to new customers in scientific, military and academic industries. An advantage of our underlying software platform is that it provides common components from which to build other applications. This enables the acceleration of development and commercialization of new products as market opportunities are identified. Marlin, our newest software solution for optimizing offshore operations is an example where we leveraged the underlying software platform to quickly develop a new offering.
Products and services for our Optimizations Software & Services group include the following:
Towed Streamer Command & Control System — Our command and control software for towed streamer acquisition, Orca, integrates acquisition, planning, positioning, source and quality control systems into a seamless operation.
Ocean Bottom Command & Control System — Gator is our integrated navigation and data management system for multi-vessel OBS, electromagnetic and transition zone operations.
Survey Planning and Optimization — We offer consulting services for planning and supervising complex surveys, including for 4-D (time lapse) and wide-azimuth survey operations. Our acquisition expertise and in-field software platforms are designed to allow clients, including both E&P companies and seismic data acquisition contractors, to optimize these complex surveys, improving efficiencies, data quality and reducing costs. Our Orca and Gator systems are designed to integrate with our post-survey tools for processing, analysis and data quality control. Orca and Gator both have modules that enable in-field survey optimization. These modules are designed to enable improved, safer acquisition through analysis and prediction of sea currents and integration of the information into the acquisition plan.
Optimization Software Marlin is a cloud-based software designed to maximize the safety and efficiency of complex offshore operations by automatically integrating a variety of data sources in real-time with operational plans to improve situational awareness and decision making. Akin to air traffic control systems, Marlin enables multiple stakeholders to share and visualize vessel route plans, foresee and avoid conflicts between vessels and fixed assets, optimize schedules safely within a rules-based environment, and measure and improve asset performance.
Products of our Devices group include the following:
Marine Positioning SystemsOur marine towed streamer positioning system includes streamer cable depth control devices, lateral control devices, compasses, acoustic positioning systems and other auxiliary sensors. This equipment is designed to control the vertical and horizontal positioning of the streamer cables and provides acoustic, compass and depth measurements to allow processors to tie navigation and location data to geophysical data to determine the location of potential hydrocarbon reserves. DigiBIRD II™ is designed to maintain streamers at pre-defined target depths more safely, efficiently, and cost effectively than ever before by eliminating workboat operations for battery changes on the majority of seismic surveys. DigiFIN® is an advanced lateral streamer control system that we commercialized in 2008. DigiFIN® is designed to maintain tighter, more uniform marine streamer separation along the entire length of the streamer cable, which allows for better sampling of seismic data and improved subsurface images. We believe DigiFIN® also enables faster line changes and minimizes the requirements for in-fill seismic work. In addition to manufacturing new marine positioning system devices, the Devices group also repairs its positioning equipment previously sold to its customers.
Analog Geophones — Analog geophones are sensors that measure acoustic energy reflected from rock layers in the Earth’s subsurface using a mechanical, coil-spring element. We manufacture and market a full suite of geophones and geophone test equipment that operate in most environments, including land surface, transition zone and downhole. Our geophones are used in other industries as well.
Ocean Bottom Integrated Technologies Segment
ION offers a fully-integrated OBS solution that includes expert survey design, planning and optimization, to maximize seismic image quality; safe, efficient data acquisition; superior imaging; and data processing, interpretation and reservoir services.

We believe the market for ocean bottom seismic imaging is growing. OBS provides more detailed reservoir imaging typically used for development rather than exploration objectives, leading E&P companies to prioritize in ocean bottom seismic activities, consistent with their desire for higher-quality seismic imaging for complex geological formations and more detailed reservoir characteristics. Since introducing our first ocean bottom acquisition system, VSO, in 2004, we have continued to develop advanced ocean bottom systems and continue to evolve our strategy which now includes licensing of our 4Sea™ technology making it available more broadly to all OBS service providers on a value-based pricing model. Such licensing will be recognized through the relevant segment, either E&P Technology & Services or Operations Optimization. This change in strategy resulted in a write down of $36.6 million for our cable-based ocean bottom acquisition technologies.
INOVA Geophysical Products
INOVA manufactures land acquisition systems, including the G3i® HD, ARIES® and Hawk® recording platforms, land source products, including the AHV-IV series, UNIVIB®, and UNIVIB 2 vibroseis vehicles, and source controllers and multicomponent sensors, including the VectorSeis® digital 3C receivers.
Product Research and Development
Our ability to compete effectively in the seismic market depends principally upon continued innovation in our underlying technologies. As such, the overall focus of our research and development efforts has remained on improving both the quality of the subsurface images we generate and the economics, efficiency and quality of the seismic data. In particular, we have concentrated on enhancing the nature and quality of the information that can be extracted from the subsurface images.
Research and development efforts in 2018 targeted the consolidation of key technologies across ION, together with the expansion of our portfolio of product offerings. A range of new technologies have been developed, including new and flexible seismic acquisition optimization and processing tools, in-water control devices which improve the operational efficiency of marine sources and the next generation ocean bottom nodal system.
The Optimization Software & Services group continued development of survey optimization and integration capabilities across the software portfolio as well as with products from the Devices group. Investment continued in the Marlin simultaneous operations tool including the aim of addressing alternative market opportunities.
Development within the Devices group was focused on the new in-water control device, SailWing™, including sea trials and integration with the Orca and Gator software products, as well as further development of the successful Digi family of products, including the automatic Streamer Recovery Device and rechargeable battery option. We continue to invest in the development of new sensors with applicability both within and outside the seismic business.
The Imaging Services group continued to invest in production efficiencies, leading-edge technologies and OBS capabilities. Research continued into advanced imaging techniques such as the extension of FWI to allow the use of reflection data as well as high-frequency FWI.
As many of these new services and products are under development and, as the development cycles from initial conception through to commercial introduction can extend over a number of years, their commercial feasibility or degree of commercial acceptance may not yet be established. No assurance can be given concerning the successful development of any new service or product, any enhancements to them, the specific timing of their release or their level of acceptance in the marketplace.
Markets and Customers
Our primary customers are E&P companies to whom we market and offer services, primarily multi-client seismic data programs from our Ventures group, imaging-related processing services from our Imaging Services group, as well as consulting services from our E&P Advisors and Optimization Software & Services group. In 2018, E&P companies accounted for approximately 77% of our total consolidated net revenues. Secondarily, seismic contractors purchase our towed streamer data acquisition systems and related equipment and software to collect data in accordance with their E&P company customers’ specifications or for their own seismic data libraries.
A significant portion of our marketing effort is focused on areas outside of the United States. Foreign sales are subject to special risks inherent in doing business outside of the United States, including the risk of political instability, armed conflict, civil disturbances, currency fluctuations, embargo and governmental activities, customer credit risks and risk of non-compliance with U.S. and foreign laws, including tariff regulations and import/export restrictions.
We sell our services and products through a direct sales force consisting of employees and international third-party sales representatives responsible for key geographic areas. The majority of our foreign sales are denominated in U.S. dollars. During 2018, 2017 and 2016, sales to destinations outside of North America accounted for approximately 75%, 76% and 78% of our consolidated net revenues, respectively. Further, systems and equipment sold to domestic customers are frequently deployed internationally and, from time to time, certain foreign sales require export licenses.

Traditionally, our business has been seasonal, with strongest demand typically in the second half of our fiscal year.
For information concerning the geographic breakdown of our consolidated net revenues, see Footnote 2 “Segment and Geographic Information” of Footnotes to Consolidated Financial Statements contained elsewhere in this Annual Report on Form 10-K for additional information.
Competition
Our Ventures group within our E&P Technology & Services segment faces competition in creating, developing and selling multi-client data libraries from a number of companies.  CGG (an integrated geophysical company) and Schlumberger (a large integrated oilfield services company) are shifting to an asset light strategy, joining TGS-NOPEC Geophysical Company ASA and Spectrum ASA.  PGS and Polarcus run acquisition crews and also compete in multi-client data acquisition.  BGP operates in this space by primarily partnering with the year ended aforementioned competitors to develop and sell multi-client data. 
Our Imaging Services group within our E&P Technology & Services segment competes with companies that provide data processing services to E&P companies. See “Services and Products - E&P Technology & Services Segment.” While the barriers to enter this market are relatively low, we believe the barriers to compete at the higher end of the market - the advanced pre-stack depth migration market where our efforts are focused - are significantly higher. At the higher end of this market, CGG and Schlumberger are our two primary competitors for advanced imaging services.  Both of these companies are significantly larger than ION in terms of revenue, processing locations and sales, marketing and financial resources.
In the OBS market, we compete with a number of companies, including Magseis Fairfield, Seabed Geosolutions (a joint venture of Fugro and CGG), and BGP. The OBS market primarily addresses the production end of the E&P business. This market is primarily vertically integrated with a variety of proprietary technologies, comprising both cable and nodal systems. Most companies operate one to three crews, and there have been four new entrants in the last few years.     
The market for seismic services and products is highly competitive and characterized by frequent changes in technology. Our principal competitor for marine seismic equipment is Sercel (a manufacturing subsidiary of CGG). Sercel has the advantage of being able to sell its products and services to its parent company that operates both land and marine crews, providing it with a significant and stable internal market and a greater ability to test new technology in the field. The recent downturn in the industry has disrupted traditional buying patterns. We have seen a generally increasing trend of companies such as Petroleum GeoServices ASA (“PGS”) developing their own instrumentation to create a competitive advantage through products such as GeoStreamer. We also compete with other seismic equipment companies on a product-by-product basis. Our ability to compete effectively in the manufacture and sale of seismic instruments and data acquisition systems depends principally upon continued technological innovation, as well as pricing, system reliability, reputation for quality and ability to deliver on schedule.
Some seismic contractors design, engineer and manufacture seismic acquisition technology in-house (or through a network of third-party vendors) to differentiate themselves. Although this technology competes directly with our towed streamer, and ocean bottom equipment, it is not usually made available to other seismic acquisition contractors. However, the risk exists that other seismic contractors may decide to develop their own seismic technology, which would put additional pressure on the demand for our acquisition equipment.
In addition, we expect reductions in the market for spare parts and service of existing equipment as a result of the fleet reductions currently occurring in the marine seismic market. CGG and WesternGeco, who traditionally had large fleet market shares, have both announced their intention to move to an asset light business model.
In the land seismic equipment market, where INOVA competes, the principal competitors are Sercel and Geospace Technologies. INOVA is a joint venture with BGP as a majority stake owner. BGP purchases land seismic equipment from both INOVA and competing land equipment suppliers.
Intellectual Property
We rely on a combination of patent, copyright and trademark laws, trade secrets, confidentiality procedures and contractual provisions to protect our proprietary technologies. We have approximately 500 patents and pending patent applications, including filings in international jurisdictions with respect to the same kinds of technologies. Although our portfolio of patents is considered important to our operations, and particular patents may be material to specific business lines, no one patent is considered essential to our consolidated business operations.

Our patents, copyrights and trademarks offer us only limited protection. Our competitors may attempt to copy aspects of our products despite our efforts to protect our proprietary rights, or may design around the proprietary features of our products. Policing unauthorized use of our proprietary rights is difficult, and we may be unable to determine the extent to which such use occurs. Our difficulties are compounded in certain foreign countries where the laws do not offer as much protection for proprietary rights as the laws of the United States, including the potential for adverse decisions by judicial or administrative bodies in foreign countries with unpredictable or corrupt judicial systems. From time to time, third parties inquire and claim that we have infringed upon their intellectual property rights and we make similar inquiries and claims to third parties. Material intellectual property litigation is discussed in detail in Item 3. “Legal Proceedings.”
The information contained in this Annual Report on Form 10-K contains references to trademarks, service marks and registered marks of ION and our subsidiaries, as indicated. Except where stated otherwise or unless the context otherwise requires, the terms “VectorSeis,” “ARIES II,” “DigiFIN,” “DigiCOURSE,” “Hawk,” “Orca,” “G3i,” “WiBand,”,“UNIVIB”, “VectorSeis and “MESA” refer to the VECTORSEIS®, ARIES® II, DigiFIN®, DigiCOURSE®, HAWK®, ORCA®, G3I®, WiBand®, UNIVIB®, VectorSeis® and MESA® registered marks owned by ION or INOVA Geophysical or their affiliates, and the terms “BasinSPAN,” “Calypso,” “DigiSTREAMER,” “Gator,” “AHV-IV,” “Vib Pro,” “Shot Pro,” “Optimiser,” “Reflex,” “ResSCAN,” “PrecisION”, “SailWing”, “Marlin” and “4Sea,” refer to the BasinSPAN™, Calypso™, DigiSTREAMER™, GATOR™, AHV-IV™, Vib Pro™, Shot Pro™, Optimiser™, Reflex™, ResSCAN™, PrecisION™, SailWing™, Marlin™ and 4Sea™ trademarks and service marks owned by ION or INOVA Geophysical or their affiliates.
Regulatory Matters
Our operations are subject to various international conventions, laws and regulations in the countries in which we operate, including laws and regulations relating to the importation of and operation of seismic equipment, currency conversions and repatriation, oil and gas exploration and development, taxation of offshore earnings and earnings of expatriate personnel, environmental protection, the use of local employees and suppliers by foreign contractors and duties on the importation and exportation of equipment. Our operations are subject to government policies and product certification requirements worldwide. Governments in some foreign countries have become increasingly active in regulating the companies holding concessions, the exploration for oil and gas and other aspects of the oil and gas industries in their countries. In some areas of the world, this governmental activity has adversely affected the amount of exploration and development work done by major oil and gas companies and may continue to do so. Operations in less developed countries can be subject to legal systems that are not as mature or predictable as those in more developed countries, which can lead to greater uncertainty in legal matters and proceedings (including the potential for adverse decisions by judicial or administrative bodies in foreign countries with unpredictable or corrupt judicial systems). We are required to consent to home country jurisdiction in many of our contracts with foreign state-owned companies, particularly those countries where our data are acquired.
Changes in these conventions, regulations, policies or requirements could affect the demand for our services and products or result in the need to modify them, which may involve substantial costs or delays in sales and could have an adverse effect on our future operating results. Our export activities are subject to extensive and evolving trade regulations. Certain countries are subject to trade restrictions, embargoes and sanctions imposed by the U.S. government. These restrictions and sanctions prohibit or limit us from participating in certain business activities in those countries.
Our operations are also subject to numerous local, state and federal laws and regulations in the United States and in foreign jurisdictions concerning the containment and disposal of hazardous materials, the remediation of contaminated properties and the protection of the environment. While the industry has experienced an increase in general environmental regulation worldwide and laws and regulations protecting the environment have generally become more stringent, we do not believe compliance with these regulations has resulted in a material adverse effect on our business or results of operations, and we do not currently foresee the need for significant expenditures in order to be able to remain compliant in all material respects with current environmental protection laws. Regulations in this area are subject to change, and there can be no assurance that future laws or regulations will not have a material adverse effect on us.
Our customers’ operations are also significantly impacted in other respects by laws and regulations concerning the protection of the environment and endangered species. For instance, many of our marine contractors have been affected by regulations protecting marine mammals in the Gulf of Mexico. To the extent that our customers’ operations are disrupted by future laws and regulations, our business and results of operations may be materially adversely affected.
Employees
As of December 31, 20172018, we had 496 regular, full-time employees, 292 of whom were located in the U.S. From time to time and on an as-needed basis, we supplement our regular workforce with individuals that we hire temporarily or retain as independent contractors in order to meet certain internal manufacturing or other business needs. Our U.S. employees are not represented by any collective bargaining agreement, and we have never experienced a labor-related work stoppage. We believe that our employee relations are satisfactory.

Financial Information by Segment and Geographic Area
For a discussion of financial information by business segment and geographic area, see Footnote 2 “Segment and Geographic Information” of Footnotes to Consolidated Financial Statements.
Available Information
Our executive headquarters are located at 2105 CityWest Boulevard, Suite 100, Houston, Texas 77042-2839. Our telephone number is (281) 933-3339. Our home page on the Internet is www.iongeo.com. We make our website content available for information purposes only. Unless specifically incorporated by reference in this Annual Report on Form 10-K, information that you may find on our website is not part of this report.
In portions of this Annual Report on Form 10-K, we incorporate by reference information from parts of other documents filed with the Securities and Exchange Commission (“SEC”). The SEC allows us to disclose important information by referring to it in this manner, and you should review this information. We make our annual reports on February 8, 2018 (the “Original Filing”) solely (i)Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, annual reports to stockholders, and proxy statements for our stockholders’ meetings, as well as any amendments, available free of charge through our website as soon as reasonably practicable after we electronically file an amended Item 8those materials with, or furnish them to, correct the inadvertent omission duringSEC.
You can learn more about us by reviewing our SEC filings on our website. Our SEC reports can be accessed through the edgarization process of paragraph headers in Grant Thornton LLP’s opinionInvestor Relations section on the financialour website. The SEC also maintains a website at www.sec.gov that contains reports, proxy statements, and (ii) to file an amended other information regarding SEC registrants, including our company.
Item 9A to correct1A. Risk Factors
This report contains or incorporates by reference statements concerning our future results and performance and other matters that are “forward-looking” statements within the inadvertent omission during the edgarization processmeaning of paragraph headers in Grant Thornton LLP’s opinion on internal control over financial reporting.
Except as expressly set forth above, this 10-K/A does not, and does not purport to, amend, update, or restate the information in any other itemSection 27A of the Original Filing. Nothing within this 10-K/A has re-stated or altered the financials contained in the Original Filing in any manner. This 10-K/A does not affect the XBRL data in the Original Filing.



Item 9A. ControlsSecurities Act of 1933, as amended (“Securities Act”), and Procedures
(a) EvaluationSection 21E of Disclosure Controls and Procedures. Disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file with or submit to the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange(“Exchange Act”), is recorded, processed, summarized. These statements involve known and reported withinunknown risks, uncertainties and other factors that may cause our or our industry’s results, levels of activity, performance, or achievements to be materially different from any future results, levels of activity, performance, or achievements expressed or implied by such forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “would,” “should,” “intend,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” or “continue” or the time period specifiednegative of such terms or other comparable terminology. Examples of other forward-looking statements contained or incorporated by reference in this report include statements regarding:
any additional damages or adverse rulings in the WesternGeco litigation and future potential adverse effects on our financial results and liquidity;
future levels of capital expenditures of our customers for seismic activities;
future oil and gas commodity prices;
the effects of current and future worldwide economic conditions (particularly in developing countries) and demand for oil and natural gas and seismic equipment and services;
future cash needs and availability of cash to fund our operations and pay our obligations;
the effects of current and future unrest in the Middle East, North Africa and other regions;
the timing of anticipated revenues and the recognition of those revenues for financial accounting purposes;
the effects of ongoing and future industry consolidation, including, in particular, the effects of consolidation and vertical integration in the towed marine seismic streamers market;
the timing of future revenue realization of anticipated orders for multi-client survey projects and data processing work in our E&P Technology & Services segment;
future levels of our capital expenditures;
future government laws or regulations pertaining to the oil and gas industry, including trade restrictions, embargoes and sanctions imposed by the SEC’s rules and forms. Disclosure controls and procedures are definedU.S. government;
future government actions that may result in Rule 13a-15(e) under the Exchange Act, and they include, without limitation, controls and procedures designed to ensure that information required to be disclosed under the Exchange Act is accumulated and communicated to management,deprivation of our contractual rights, including the principal executive officerpotential for adverse decisions by judicial or administrative bodies in foreign countries with unpredictable or corrupt judicial systems.
expected net revenues, income from operations and the principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.net income;
Our management carried out an evaluation of the effectiveness of the designexpected gross margins for our services and operation of our disclosure controls and procedures as of December 31, 2017. Based upon that evaluation, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures were effective as of December 31, 2017.
(b)Management’s Report on Internal Control Over Financial Reporting. Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) under the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that:
(i)pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of our company;
(ii)provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of our company are being made only in accordance with authorizations of our management and directors; and
(iii)provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we assessed the effectiveness of our internal control over financial reporting as of December 31, 2017 based upon criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).
The independent registered public accounting firm that has also audited our consolidated financial statements included in this Annual Report on Form 10-K has issued an audit report on our internal control over financial reporting. This report appears below.
(c)Changes in Internal Control over Financial Reporting. There was not any change in our internal control over financial reporting that occurred during the three months ended December 31, 2017, which has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.



products;
        

Reportfuture seismic industry fundamentals, including future demand for seismic services and equipment;
future benefits to our customers to be derived from new services and products;
future benefits to be derived from our investments in technologies, joint ventures and acquired companies;
future growth rates for our services and products;
the degree and rate of Independent Registered Public Accounting Firmfuture market acceptance of our new services and products;
expectations regarding E&P companies and seismic contractor end-users purchasing our more technologically-advanced services and products;
anticipated timing and success of commercialization and capabilities of services and products under development and start-up costs associated with their development;
future opportunities for new products and projected research and development expenses;
expected continued compliance with our debt financial covenants;
expectations regarding realization of deferred tax assets;
expectations regarding the impact of the U.S. Tax Cuts and Jobs Act;
anticipated results with respect to certain estimates we make for financial accounting purposes; and
compliance with the U.S. Foreign Corrupt Practices Act and other applicable U.S. and foreign laws prohibiting corrupt payments to government officials and other third parties.
These forward-looking statements reflect our best judgment about future events and trends based on the information currently available to us. Our results of operations can be affected by inaccurate assumptions we make or by risks and uncertainties known or unknown to us. Therefore, we cannot guarantee the accuracy of the forward-looking statements. Actual events and results of operations may vary materially from our current expectations and assumptions. While we cannot identify all of the factors that may cause actual results to vary from our expectations, we believe the following factors should be considered carefully:
An unfavorable outcome in our pending litigation matter with WesternGeco could have a materially adverse effect on our financial results and liquidity.
In June 2009, WesternGeco L.L.C. (“WesternGeco”) filed a lawsuit against us in the United States District Court for the Southern District of Texas (the “District Court”). In the lawsuit, styled WesternGeco L.L.C. v. ION Geophysical Corporation, WesternGeco alleged that we had infringed several of their patents concerning marine seismic surveys.
Trial began in July 2012, and the jury returned a verdict in August 2012. The jury found that we infringed the “claims” contained in four of WesternGeco’s patents by supplying our DigiFIN® lateral streamer control units from the United States, and awarded WesternGeco more than $100 million in damages. (In patent law, a “claim” is the technical legal term; an infringer infringes on one or more “claims” of a given patent.)
In May 2014, the District Court entered a Final Judgment against us in the amount of $123.8 million. This included the jury award ($12.5 million in reasonable royalties plus $93.4 million in lost profits), $10.9 million in pre-judgment interest on lost profits, and $9.4 million in supplemental damages that the judge imposed for DigiFIN® units that were supplied from the U.S. during the trial and during other periods that the jury did not consider. The Final Judgment also enjoined us from supplying DigiFINs or any parts unique to DigiFINs in or from the United States. We have conducted our business in compliance with the District Court’s orders, and have reorganized our operations such that we no longer supply DigiFINs or any parts unique to DigiFINs in or from the United States.
On July 2, 2015, the United States Court of Appeals for the Federal Circuit in Washington, D.C. (the “Court of Appeals”) reversed, in part, the District Court, holding that the lost profits, which were attributable to foreign seismic surveys, were not available to WesternGeco under the Patent Act. We had recorded a loss contingency accrual of $123.8 million because of the District Court’s ruling. As a result of the reversal by the Court of Appeals, we reduced the loss contingency accrual to $22.0 million.
On February 26, 2016, WesternGeco appealed the Court of Appeals’ decision to the Supreme Court, as to both lost profits and “enhanced” damages (damages which are available for willful infringement, and which neither the District Court nor the Trial Court awarded). On June 20, 2016, the Supreme Court vacated the Court of Appeals’ ruling, although it did not address lost profits at that time. Rather, in light of changes in case law regarding the standard of proof for willfulness in patent infringement, the Supreme Court remanded the case to the Court of Appeals for a determination of whether enhanced damages were appropriate.

Board of Directors and Stockholders
ION Geophysical Corporation

OpinionOn November 14, 2016, the District Court ordered our sureties to pay principal and interest on internal control over financial reportingthe royalty damages previously awarded. On November 25, 2016, we paid WesternGeco the $20.8 million due pursuant to the order, and reduced our loss contingency accrual to zero.
WeOn March 14, 2017, the District Court held a hearing on whether impose additional damages for willfulness. The Judge found that our infringement was willful, and awarded enhanced damages of $5.0 million to WesternGeco (WesternGeco had sought $43.6 million in such damages.) The District Court also ordered the appeal bond to be released and discharged. The Court’s findings and ruling were memorialized in an order issued on May 16, 2017. On June 30, 2017, we and WesternGeco agreed that neither of us would appeal the District Court's award of $5.0 million in enhanced damages. Upon assessment of the enhanced damages, we accrued $5.0 million in the first quarter of 2017. As we have auditedpaid the internal control over financial reporting of ION Geophysical Corporation (a Delaware corporation)$5.0 million, the accrual has been adjusted, and subsidiaries (the “Company”) as of December 31, 2017, based on criteria established2018, the loss contingency accrual was zero.
WesternGeco filed a second petition in the 2013 Internal Control-Integrated Framework issuedSupreme Court on February 17, 2017, appealing the lost profits issue again. On May 30, 2017, the Supreme Court called for the U.S. Solicitor General’s views on whether or not the Supreme Court ought to hear WesternGeco’s appeal. On December 6, 2017, the Solicitor General filed its brief, and took the position that the Supreme Court ought to hear the appeal and that foreign lost profits ought to be available. On January 12, 2018, the Supreme Court agreed to hear the appeal. The specific issue before the Supreme Court was whether lost profits arising from use of prohibited combinations occurring outside of the United States are categorically unavailable in cases where patent infringement is proven under 35 U.S.C. § 271(f)(2) (the statute under which we were held to have infringed WesternGeco’s patents, and upon which the District Court and Court of Appeals relied in entering their rulings).
The Supreme Court heard oral arguments on April 16, 2018. We argued that the Court of Appeals’ decision that eliminated lost profits ought to be affirmed. WesternGeco and the Solicitor General argued that the Court of Appeals’ decision that eliminated lost profits ought to be reversed.
On June 22, 2018, the Supreme Court reversed the judgment of the Court of Appeals, held that the award of lost profits to WesternGeco by the CommitteeDistrict Court was a permissible application of Sponsoring OrganizationsSection 284 of the Treadway Commission (COSO). In our opinion,Patent Act, and remanded the Company maintained,case back to the Court of Appeals for further proceedings consistent with its (the Supreme Court’s) opinion. On July 24, 2018, the Supreme Court issued the judgment that returned the case to the Court of Appeals.
On July 27, 2018, the Court of Appeals vacated its September 21, 2016 judgment with respect to damages, and ordered WesternGeco and us to submit supplemental briefing on what relief is appropriate in all material respects, effective internal control over financial reporting aslight of December 31, 2017, based on criteria established in the 2013 Internal Control-Integrated Framework issued by COSO.
Supreme Court’s decision. We also have audited,and WesternGeco each submitted briefing in accordance with the standardsCourt of Appeals’ order (the last brief was filed on September 7, 2018).
We argued in our brief to the Court of Appeals that lost profits were not available to WesternGeco because the jury instructions required them to find that we had been WesternGeco’s direct competitor in the survey markets where WesternGeco had lost profits, and that the jury could not have found so. Additionally, we argued that the award of lost profits and reasonable royalties ought to be vacated and retried on separate grounds due to the outcome of an Inter Partes Review (“IPR”) filed with the Patent Trial and Appeal Board (“PTAB”) of the Public Company Accounting Oversight Board (United States) (“PCAOB”)Patent and Trademark Office.
Until the Court of Appeals’ January 11, 2019 decision issued (which is described below), the consolidated financial statementsIPR was an administrative proceeding that was separate from the 2009 lawsuit. By means of the Company asIPR, we joined a challenge to the validity of andseveral of WesternGeco’s patent claims that another company had filed. While the 2009 lawsuit was pending on appeal, the PTAB invalidated four of the six patent claims that formed the basis for the year endedlawsuit judgment against us. WesternGeco appealed the PTAB’s invalidation of its patents to the Court of Appeals. On May 7, 2018, the Court of Appeals affirmed the PTAB’s invalidation of the patents, and on July 16, 2018, the Court of Appeals denied WesternGeco’s petition for a rehearing. On December 31, 2017,13, 2018, WesternGeco filed a petition with the Supreme Court, arguing that the Court of Appeals ought to have overturned the decision of the PTAB. (As of February 7, 2019, the Supreme Court has not indicated whether it will, or will not, hear WesternGeco’s appeal.)
In the same brief to the Court of Appeals in which we made our “direct competitor” argument, we argued that the Court of Appeals’ affirmation of the PTAB’s decision precluded WesternGeco’s damages claims, and that the Court of Appeals should order a new trial as to the royalty damages already paid by us. We also argued that if the Court of Appeals did not find our report dated February 8,“direct competitor” argument persuasive, the Court should nonetheless vacate the District Court’s award of royalty damages and lost profits damages and order a new trial as to both royalty damages and lost profits.
In its briefs to the Court of Appeals, WesternGeco argued that the only remaining issue was whether lost profits were unavailable to WesternGeco due to our “direct competitor” argument, and argued that the invalidation of four of its six patent claims by the PTAB (which was affirmed by the Court of Appeals) should have no effect on lost profits or on the royalty award already paid by us. WesternGeco also argued that lost profits should be available notwithstanding our “direct competitor” argument.

Oral arguments took place on November 16, 2018, expressedand on January 11, 2019, the Court of Appeals issued its ruling. In its ruling, the Court of Appeals refused to disturb the award of reasonable royalties to WesternGeco (which we paid in 2016), and rejected our “direct competitor” argument, but vacated the District Court’s award of lost profits damages and remanded the case back to the District Court to determine whether to hold a new trial as to lost profits. The Court of Appeals also ruled that its affirmance of the PTAB’s decision eliminated four of the five patent claims that could have supported the award of lost profits, leaving only one remaining patent claim that could support an unqualified opinion on those financial statements.
Basis for opinionaward of lost profits.
The Company’s management is responsibleCourt of Appeals further held that the lost profits award can be reinstated by the District Court if the existing trial record establishes that the jury must have found that the technology covered by the one remaining patent claim was essential for maintaining effective internal control over financial reporting and for its assessmentperforming the surveys upon which lost profits were based. To make such a finding, the District Court must conclude that the present trial record establishes that there was no dispute that the technology covered by the one remaining patent claim, independent of the effectivenesstechnology of internal control over financial reporting, includedthe now-invalid claims, was required to perform the surveys. The Court of Appeals ruling further provides that if, but only if, the District Court concludes that WesternGeco established at trial, with undisputed evidence, that the remaining claim covers technology that was necessary to perform the surveys, then the District Court may deny a new trial and reinstate lost profits.
We may not ultimately prevail in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOBlitigation and arewe could be required to be independent with respectpay some or all of the lost profits that were awarded by the District Court, plus interest, if the District Court denies a new trial on lost profits, or if a new trial is granted and a new judgment issues. Our assessment that we do not have a loss contingency may change in the future due to developments at the Supreme Court, Court of Appeals, or District Court, and other events, such as changes in applicable law, and such reassessment could lead to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the riskdetermination that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Definition and limitations of internal control over financial reporting
A company’s internal control over financial reportingsignificant loss contingency is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets thatprobable, which could have a material effect on the Company’s business, financial statements.condition and results of operations.
BecauseOur business depends on the level of its inherent limitations, internal control overexploration and production activities by the oil and natural gas industry. If capital expenditures by E&P companies decline,typically because of lower price realizations for oil and natural gas, the demand for our services and products would decline and our results of operations would be materially adversely affected.
Demand for our services and products depends upon the level of spending by E&P companies and seismic contractors for exploration and production activities, and those activities depend in large part on oil and gas prices. Spending by our customers on services and products that we provide is highly discretionary in nature, and subject to rapid and material change. Any decline in oil and gas related spending on behalf of our customers could cause alterations in our capital spending plans, project modifications, delays or cancellations, general business disruptions or delays in payment, or non-payment of amounts that are owed to us, any one of which could have a material adverse effect on our financial reportingcondition. Additionally, the recent increases in oil and gas prices may not preventincrease demand for our services and products or detect misstatements.otherwise have a positive effect on our financial condition or results of operations. E&P companies’ willingness to explore, develop and produce depends largely upon prevailing industry conditions that are influenced by numerous factors over which our management has no control, such as:
the supply of and demand for oil and gas;
the level of prices, and expectations about future prices, of oil and gas;
the cost of exploring for, developing, producing and delivering oil and gas;
the expected rates of decline for current production;
the discovery rates of new oil and gas reserves;
weather conditions, including hurricanes, that can affect oil and gas operations over a wide area, as well as less severe inclement weather that can preclude or delay seismic data acquisition;
domestic and worldwide economic conditions;
changes in government leadership, such as the change in presidency in Mexico and its impact on the Mexican economy and offshore exploration programs;
political instability in oil and gas producing countries;
technical advances affecting energy consumption;
government policies regarding the exploration, production and development of oil and gas reserves;
the ability of oil and gas producers to raise equity capital and debt financing;
merger and divestiture activity among oil and gas companies and seismic contractors; and
compliance by members of the OPEC and non-OPEC members such as Russia, with agreements to cut oil production.

The level of oil and gas exploration and production activity has been volatile in recent years. Trends in oil and gas exploration and development activities have declined, together with demand for our services and products. Any prolonged substantial reduction in oil and gas prices would likely further affect oil and gas production levels and therefore adversely affect demand for the services we provide and products we sell.
Our operating results often fluctuate from period to period, and we are subject to cyclicality and seasonality factors.
Our industry and the oil and gas industry in general are subject to cyclical fluctuations. Demand for our services and products depends upon spending levels by E&P companies for exploration and production of oil and natural gas and, in the case of new seismic data acquisition, the willingness of those companies to forgo ownership of the seismic data. Capital expenditures by E&P companies for these activities depend upon several factors, including actual and forecasted prices of oil and natural gas and those companies’ short-term and strategic plans.
Since 2015, E&P companies shifted their focus more to production activities and less on exploration due to declining oil and gas prices resulted in decreasing revenues and prompted cost reduction initiatives across the industry. The price of Brent crude oil increased to an average of $71 per barrel in 2018 due to the combination of robust global demand and sustained OPEC production cuts after a long period of unrestrained output relative to past periods. Before the end of 2018, Brent crude oil prices fell to nearly $50 per barrel and the U.S. Energy Information Administration (“EIA”) forecasts the Brent crude oil spot price will average $61 per barrel in 2019 and $65 per barrel in 2020. The price decrease resulted from concerns of oversupply and slower than expected pace of oil demand growth. Energy prices, which include oil, natural gas and coal, are projected to stabilize overall in the near-term as demand and supply comes into equilibrium. As of December 31, 2018, our E&P Technology & Services segment backlog, consisting of commitments for data processing work and for underwritten multi-client New Venture and proprietary projects decreased by 44% compared to our existing backlog as of December 31, 2017. The decrease in our backlog is attributable to the timing of finalizing contracts.
Our operating results are subject to fluctuations from period to period as a result of introducing new services and products, the timing of significant expenses in connection with customer orders, unrealized sales, levels of research and development activities in different periods, the product and service mix of our revenues and the seasonality of our business. Because some of our products are technologically complex and tend to be relatively large investments, we generally experience long sales cycles for these types of products with a series of technical and commercial reviews by our customers and historically incur significant expense at the beginning of these cycles. In addition, the revenues can vary widely from period to period due to changes in customer requirements and demand. These factors can create fluctuations in our net revenues and results of operations from period to period. Variability in our overall gross margins for any period, which depend on the percentages of higher-margin and lower-margin services and products sold in that period, compounds these uncertainties. As a result, if net revenues or gross margins fall below expectations, our results of operations and financial condition will likely be materially adversely affected.
Additionally, our business can be seasonal in nature, with strongest demand typically in the second half of each year. Customer budgeting cycles at times result in higher spending activity levels by our customers at different points of the year.
Due to the high value of many of our products and seismic data libraries as they tend to be relatively large investments, our quarterly operating results have historically fluctuated from period to period due to the timing of orders and shipments and the mix of services and products sold. This uneven pattern makes financial predictions for any given period difficult, increases the risk of unanticipated variations in our quarterly results and financial condition, and places challenges on our inventory management. Delays caused by factors beyond our control can affect our E&P Technology & Services segment’s revenues from its imaging and multi-client services from period to period. Also, projectionsdelays in ordering products or in shipping or delivering products in a given period could significantly affect our results of operations for that period. Fluctuations in our quarterly operating results may cause greater volatility in the market price of our common stock.
Our indebtedness could adversely affect our liquidity, financial condition and our ability to fulfill our obligations and operate our business.
As of December 31, 2018, our total outstanding indebtedness (including capital lease obligations) was approximately $121.7 million, consisting primarily of approximately $120.6 million outstanding Second Lien Notes and $2.9 million of capital leases, partially offset by $2.9 million of debt issuance costs. As of December 31, 2018, there was no outstanding indebtedness under our Credit Facility. Under our Credit Facility, as amended, the lender has committed $50.0 million of revolving credit, subject to a borrowing base. As of December 31, 2018, we have $41.9 million of borrowing base availability under the Credit Facility. The amount available will increase or decrease monthly as our borrowing base changes. We may also incur additional indebtedness in the future. See Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”
In October 2016, S&P Global Ratings (“S&P”) raised our corporate credit rating to CCC+ from SD and maintains a negative outlook. S&P continues to hold a negative outlook on our Company reflecting the high debt leverage, expected negative free cash flow and the potential for liquidity to weaken, if market conditions do not significantly improve. Following

the redemption of our Third Lien Notes in March 2018, Moody’s Investors Service has withdrawn all assigned public credit ratings on our Company, including the Caa2 Corporate Family Rating.
Our high level of indebtedness could have negative consequences to us, including:
we may have difficulty satisfying our obligations with respect to our outstanding debt;
we may have difficulty obtaining financing in the future for working capital, capital expenditures, acquisitions or other purposes;
we may need to use all, or a substantial portion, of our available cash flow to pay interest and principal on our debt, which will reduce the amount of money available to finance our operations and other business activities;
our vulnerability to general economic downturns and adverse industry conditions could increase;
our flexibility in planning for, or reacting to, changes in our business and in our industry in general could be limited;
our amount of debt and the amount we must pay to service our debt obligations could place us at a competitive disadvantage compared to our competitors that have less debt;
our customers may react adversely to our significant debt level and seek or develop alternative licensors or suppliers;
we may have insufficient funds, and our debt level may also restrict us from raising the funds necessary to repurchase all of the Notes, as defined below, tendered to us upon the occurrence of a change of control, which would constitute an event of default under the Notes; and
our failure to comply with the restrictive covenants in our debt instruments which, among other things, limit our ability to incur debt and sell assets, could result in an event of default that, if not cured or waived, could have a material adverse effect on our business or prospects.
Our level of indebtedness will require that we use a substantial portion of our cash flow from operations to pay principal of, and interest on, our indebtedness, which will reduce the availability of cash to fund working capital requirements, capital expenditures, research and development and other general corporate or business activities.
We are subject to intense competition, which could limit our ability to maintain or increase our market share or to maintain our prices at profitable levels.
Many of our sales are obtained through a competitive bidding process, which is standard for our industry. Competitive factors in recent years have included price, technological expertise, and a reputation for quality, safety and dependability. While no single company competes with us in all of our segments, we are subject to intense competition in each of our segments. New entrants in many of the markets in which certain of our services and products are currently strong should be expected. See Item 1. “Business – Competition.” We compete with companies that are larger than we are in terms of revenues, technical personnel, number of processing locations and sales and marketing resources. A few of our competitors have a competitive advantage in being part of a large affiliated seismic contractor company. In addition, we compete with major service providers and government-sponsored enterprises and affiliates. Some of our competitors conduct seismic data acquisition operations as part of their regular business, which we have traditionally not conducted, and have greater financial and other resources than we do. These and other competitors may be better positioned to withstand and adjust more quickly to volatile market conditions, such as fluctuations in oil and natural gas prices, as well as changes in government regulations. In addition, any evaluationexcess supply of effectivenessservices and products in the seismic services market could apply downward pressure on prices for our services and products. The negative effects of the competitive environment in which we operate could have a material adverse effect on our results of operations. In particular, the consolidation in recent years of many of our competitors in the seismic services and products markets has negatively impacted our results of operations.
There are a number of geophysical companies that create, market and license seismic data and maintain seismic libraries. Competition for acquisition of new seismic data among geophysical service providers historically has been intense and we expect this competition will continue to future periodsbe intense. Larger and better-financed operators could enjoy an advantage over us in a competitive environment for new data.
Our OBS operations involve numerous risks.
Through our Ocean Bottom Integrated Technologies segment, we operate as a seismic acquisition contractor concentrating on OBS data acquisition. There can be no assurance that we will achieve the expected benefits from our acquisition projects and these projects may result in unexpected costs, expenses and liabilities, which may have a material adverse effect on our business, financial condition or results of operations. Our OBS operations exposed us to operating risks:

Seismic data acquisition activities in marine ocean bottom areas are subject to the risk of downtime or reduced productivity, as well as to the risks of loss to property and injury to personnel, mechanical failures and natural disasters. In addition to losses caused by human errors and accidents, we may also become subject to losses resulting from, among other things, political instability, business interruption, strikes and weather events; and
Our OBS acquisition equipment and services may expose us to litigation and legal proceedings, including those related to product liability, personal injury and contract liability. We have in place insurance coverage against operating hazards, including product liability claims and personal injury claims, damage, destruction or business interruption and whenever possible, will obtain agreements from customers that limit our liability. However, we cannot provide assurance that the nature and amount of insurance will be sufficient to fully indemnify us against liabilities arising from pending and future claims or that its insurance coverage will be adequate in all circumstances or against all hazards, and that we will be able to maintain adequate insurance coverage in the future at commercially reasonable rates or on acceptable terms.
increased costs associated with the operation of an OBS acquisition project and the management of geographically dispersed operations;
Cash flows from OBS acquisition projects may be inadequate to realize the value of manufactured equipment for use in its OBS surveys;
risks associated with our OBS acquisition technologies, including risks that the new technology may not perform as well as we anticipate;
difficulties in retaining and integrating key technical, sales and marketing personnel and the possible loss of such employees and costs associated with their loss;
the diversion of management’s attention and other resources from other business operations and related concerns;
the requirement to maintain uniform standards, controls and procedures;
our inability to realize operating efficiencies, cost savings or other benefits that we expect from OBS operations; and
difficulties and delays in securing new business and customer projects.
The indentures governing the 9.125% Senior Secured Second-Priority Notes due 2021 (the “ Second Lien Notes”) contain a number of restrictive covenants that limit our ability to finance future operations or capital needs or engage in other business activities that may become inadequate becausebe in our interest.
The indenture governing the Second Lien Notes imposes, and the terms of changesany future indebtedness may impose, operating and other restrictions on us and our subsidiaries. Such restrictions affect, or will affect, and in many respects limit or prohibit, among other things, our ability and the ability of certain of our subsidiaries to:
incur additional indebtedness;
create liens;
pay dividends and make other distributions in respect of our capital stock;
redeem our capital stock;
make investments or certain other restricted payments;
sell certain kinds of assets;
enter into transactions with affiliates; and
effect mergers or consolidations.
The restrictions contained in the indenture governing the Second Lien Notes could:
limit our ability to plan for or react to market or economic conditions or meet capital needs or otherwise restrict our activities or business plans; and
adversely affect our ability to finance our operations, acquisitions, investments or strategic alliances or other capital needs or to engage in other business activities that the degree of compliance with the policies or procedures may deteriorate.would be in our interest.

/s/ GRANT THORNTON LLP
Houston, Texas
February 8, 2018

        

Item 8.A breach of any of these covenants could result in a default under the indenture governing the Second Lien Notes. If an event of default occurs, the trustee and holders of the Second Lien Notes could elect to declare all borrowings outstanding, together with accrued and unpaid interest, to be immediately due and payable. An event of default under the indenture governing the Second Lien Notes would also constitute an event of default under our Credit Facility. In addition, if we are unable to repay or extend the maturity of our Second Lien Notes prior to their scheduled maturity in 2021, the maturity of our Credit Facility, which currently matures in 2023, will accelerate to mature in 2021 which may cause us to face substantial liquidity problems and may force us to reduce or delay investments, dispose of material assets or operations, or issue additional debt or equity. See Footnote 5Long-term Debt and Lease Obligations of the Footnotes to Consolidated Financial Statements appearing below in this Form 10-K.
As a technology-focused company, we are continually exposed to risks related to complex, highly technical services and Supplementary Dataproducts that are sometimes operated in dangerous marine environments.
We have made, and we will continue to make, strategic decisions from time to time as to the technologies in which we invest. If we choose the wrong technology, our financial results could be adversely impacted. Our operating results are dependent upon our ability to improve and refine our seismic imaging and data processing services and to successfully develop, manufacture and market our products and other services and products. New technologies generally require a substantial investment before any assurance is available as to their commercial viability. If we choose the wrong technology, or if our competitors develop or select a superior technology, we could lose our existing customers and be unable to attract new customers, which would harm our business and operations.
New data acquisition or processing technologies may be developed. New and enhanced services and products introduced by one of our competitors may gain market acceptance and, if not available to us, may adversely affect us.
The markets for our services and products are characterized by changing technology and new product introductions. We must invest substantial capital to develop and maintain a leading edge in technology, with no assurance that we will receive an adequate rate of return on those investments. If we are unable to develop and produce successfully and timely new or enhanced services and products, we will be unable to compete in the future and our business, our results of operations and our financial statementscondition will be materially and adversely affected. Our business could suffer from unexpected developments in technology, or from our failure to adapt to these changes. In addition, the preferences and requirements of customers can change rapidly.
The businesses of our E&P Technology & Services segment and Optimization Software & Services group within our Operations Optimization segment, being more concentrated in software, processing services and proprietary technologies, have also exposed us to various risks that these technologies typically encounter, including the following:
future competition from more established companies entering the market;
technology obsolescence;
dependence upon continued growth of the market for seismic data processing;
the rate of change in the markets for these segments’ technology and services;
further consolidation of the participants within this market;
research and development efforts not proving sufficient to keep up with changing market demands;
dependence on third-party software for inclusion in these segments’ services and products;
misappropriation of these segments’ technology by other companies;
alleged or actual infringement of intellectual property rights that could result in substantial additional costs;
difficulties inherent in forecasting sales for newly developed technologies or advancements in technologies;
recruiting, training and retaining technically skilled, experienced personnel that could increase the costs for these segments, or limit their growth; and
the ability to maintain traditional margins for certain of their technology or services.
Seismic data acquisition and data processing technologies historically have progressed rather rapidly and we expect this progression to continue. In order to remain competitive, we must continue to invest additional capital to maintain, upgrade and expand our seismic data acquisition and processing capabilities. However, due to potential advances in technology and the related notes thereto required bycosts associated with such technological advances, we may not be able to fulfill this item begin at page F-1 hereof.strategy, thus possibly affecting our ability to compete.

        

Item 15. ExhibitsOur customers often require demanding specifications for performance and Financial Statement Schedulesreliability of our services and products. Because many of our products are complex and often use unique advanced components, processes, technologies and techniques, undetected errors and design and manufacturing flaws may occur. Even though we attempt to assure that our systems are always reliable in the field, the many technical variables related to their operations can cause a combination of factors that can, and have from time to time, caused performance and service issues with certain of our products. Product defects result in higher product service, warranty and replacement costs and may affect our customer relationships and industry reputation, all of which may adversely impact our results of operations. Despite our testing and quality assurance programs, undetected errors may not be discovered until the product is purchased and used by a customer in a variety of field conditions. If our customers deploy our new products and they do not work correctly, our relationship with our customers may be materially and adversely affected.
(a) ListAs a result of Documents Filedour systems’ advanced and complex nature, we expect to experience occasional operational issues from time to time. Generally, until our products have been tested in the field under a wide variety of operational conditions, we cannot be certain that performance and service problems will not arise. In that case, market acceptance of our new products could be delayed and our results of operations and financial condition could be adversely affected.
(1) Financial StatementsWe also face exposure to product liability claims in the event that certain of our products, or certain components manufactured by others that are incorporated into our products, fail to perform to specification, which failure results, or is alleged to result, in property damage, bodily injury and/or death. Marine exploration in particular can present dangerous conditions to those conducting it. Any product liability claims decided adversely against us may have a material adverse effect on our results of operations and cash flows. While we maintain insurance coverage with respect to certain product liability claims, we may not be able to obtain such insurance on acceptable terms in the future, if at all, and any such insurance may not provide adequate coverage against product liability claims. In addition, product liability claims can be expensive to defend and can divert the attention of management and other personnel for significant periods of time, regardless of the ultimate outcome. Furthermore, even if we are successful in defending against a claim relating to our products, claims of this nature could cause our customers to lose confidence in our products and us.
We have invested, and expect to continue to invest, significant sums of money in acquiring and processing seismic data for our E&P Technology & Services’ multi-client data library, without knowing precisely how much of this seismic data we will be able to license or when and at what price we will be able to license the data sets. Our business could be adversely affected by the failure of our customers to fulfill their obligations to reimburse us for the underwritten portion of our seismic data acquisition costs for our multi-client library.
We invest significant amounts in acquiring and processing new seismic data to add to our E&P Technology & Services’ multi-client data library. The costs of most of these investments are funded by our customers, with the remainder generally being recovered through future data licensing fees. In 2018, we invested approximately $28.3 million in our multi-client data library. Our customers generally commit to licensing the data prior to our initiating a new data library acquisition program. However, the aggregate amounts of future licensing fees for this data are uncertain and depend on a variety of factors, including the market prices of oil and gas, customer demand for seismic data in the library, and the availability of similar data from competitors.
By making these investments in acquiring and processing new seismic data for our E&P Technology & Services’ multi-client library, we are exposed to the following risks:
We may not fully recover our costs of acquiring and processing seismic data through future sales. The ultimate amounts involved in these data sales are uncertain and depend on a variety of factors, many of which are beyond our control.
The timing of these sales is unpredictable and can vary greatly from period to period. The costs of each survey are capitalized and then amortized as a percentage of sales and/or on a straight-line basis over the expected useful life of the data. This amortization will affect our earnings and, when combined with the sporadic nature of sales, will result in increased earnings volatility.
Regulatory changes that affect companies’ ability to drill, either generally or in a specific location where we have acquired seismic data, could materially adversely affect the value of the seismic data contained in our library. Technology changes could also make existing data sets obsolete. Additionally, each of our individual surveys has a limited book life based on its location and oil and gas companies’ interest in prospecting for reserves in such location, so a particular survey may be subject to a significant decline in value beyond our initial estimates.
The value of our multi-client data could be significantly adversely affected if any material adverse change occurs in the general prospects for oil and gas exploration, development and production activities.

The cost estimates upon which we base our pre-commitments of funding could be wrong. The result could be losses that have a material adverse effect on our financial statements filed ascondition and results of operations. These pre-commitments of funding are subject to the creditworthiness of our clients. In the event that a client refuses or is unable to pay its commitment, we could incur a substantial loss on that project.
As part of our asset-light strategy, we routinely charter vessels from third-party vendors to acquire seismic data for our multi-client business. As a result, our cost to acquire our multi-client data could significantly increase if vessel charter prices rise materially.
Reductions in demand for our seismic data, or lower revenues of or cash flows from our seismic data, may result in a requirement to increase amortization rates or record impairment charges in order to reduce the carrying value of our data library. These increases or charges, if required, could be material to our operating results for the periods in which they are recorded.
A substantial portion of our seismic acquisition project costs (including third-party project costs) are underwritten by our customers. In the event that underwriters for such projects fail to fulfill their obligations with respect to such underwriting commitments, we would continue to be obligated to satisfy our payment obligations to third-party contractors.
We derive a substantial amount of our revenues from foreign operations and sales, which pose additional risks.
The majority of our foreign sales are denominated in U.S. dollars. Sales to customer destinations outside of North America represented 75%, 76% and 78% of our consolidated net revenues for 2018, 2017 and 2016, respectively. We believe that export sales will remain a significant percentage of our revenue. U.S. export restrictions affect the types and specifications of products we can export. Additionally, in order to complete certain sales, U.S. laws may require us to obtain export licenses, and we cannot assure you that we will not experience difficulty in obtaining these licenses.
Like many energy services companies, we have operations in and sales into certain international areas, including parts of the Middle East, West Africa, Latin America, India, Asia Pacific and Russia, that are subject to risks of war, political disruption, civil disturbance, political corruption, possible economic and legal sanctions (such as possible restrictions against countries that the U.S. government may in the future consider to be state sponsors of terrorism) and changes in global trade policies. Our sales or operations may become restricted or prohibited in any country in which the foregoing risks occur. In particular, the occurrence of any of these risks could result in the following events, which in turn, could materially and adversely impact our results of operations:
disruption of E&P activities;
restriction on the movement and exchange of funds;
inhibition of our ability to collect advances and receivables;
enactment of additional or stricter U.S. government or international sanctions;
limitation of our access to markets for periods of time;
expropriation and nationalization of assets of our company or those of our customers;
political and economic instability, which may include armed conflict and civil disturbance;
currency fluctuations, devaluations and conversion restrictions;
confiscatory taxation or other adverse tax policies; and
governmental actions that may result in the deprivation of our contractual rights, including the potential for adverse decisions by judicial or administrative bodies in foreign countries with unpredictable or corrupt judicial systems.
Our international operations and sales increase our exposure to other countries’ restrictive tariff regulations, other import/export restrictions and customer credit risk.
In addition, we are subject to taxation in many jurisdictions and the final determination of our tax liabilities involves the interpretation of the statutes and requirements of taxing authorities worldwide. Our tax returns are subject to routine examination by taxing authorities, and these examinations may result in assessments of additional taxes, penalties and/or interest.

We may be unable to obtain broad intellectual property protection for our current and future products and we may become involved in intellectual property disputes; we rely on developing and acquiring proprietary data which we keep confidential.
We rely on a combination of patent, copyright and trademark laws, trade secrets, confidentiality procedures and contractual provisions to protect our proprietary technologies. We believe that the technological and creative skill of our employees, new product developments, frequent product enhancements, name recognition and reliable product maintenance are the foundations of our competitive advantage. Although we have a considerable portfolio of patents, copyrights and trademarks, these property rights offer us only limited protection. Our competitors may attempt to copy aspects of our products despite our efforts to protect our proprietary rights, or may design around the proprietary features of our products. Policing unauthorized use of our proprietary rights is difficult, and we are unable to determine the extent to which such use occurs. Our difficulties are compounded in certain foreign countries where the laws do not offer as much protection for proprietary rights as the laws of the United States.
Third parties inquire and claim from time to time that we have infringed upon their intellectual property rights. Many of our competitors own their own extensive global portfolio of patents, copyrights, trademarks, trade secrets and other intellectual property to protect their proprietary technologies. We believe that we have in place appropriate procedures and safeguards to help ensure that we do not violate a third party’s intellectual property rights. However, no set of procedures and safeguards is infallible. We may unknowingly and inadvertently take action that is inconsistent with a third party’s intellectual property rights, despite our efforts to do otherwise. Any such claims from third parties, with or without merit, could be time consuming, result in costly litigation, result in injunctions, require product modifications, cause product shipment delays or require us to enter into royalty or licensing arrangements. Such claims could have a material adverse effect on our results of operations and financial condition.
Much of our litigation in recent years have involved disputes over our and others’ rights to technology. See Item 3. “Legal Proceedings.”
To protect the confidentiality of our proprietary and trade secret information, we require employees, consultants, contractors, advisors and collaborators to enter into confidentiality agreements. Our customer data license and acquisition agreements also identify our proprietary, confidential information and require that such proprietary information be kept confidential. While these steps are taken to strictly maintain the confidentiality of our proprietary and trade secret information, it is difficult to ensure that unauthorized use, misappropriation or disclosure will not occur. If we are unable to maintain the secrecy of our proprietary, confidential information, we could be materially adversely affected.
If we do not effectively manage our transition into new services and products, our revenues may suffer.
Services and products for the geophysical industry are characterized by rapid technological advances in hardware performance, software functionality and features, frequent introduction of new services and products, and improvement in price characteristics relative to product and service performance. Among the risks associated with the introduction of new services and products are delays in development or manufacturing, variations in costs, delays in customer purchases or reductions in price of existing products in anticipation of new introductions, write-offs or write-downs of the carrying costs of inventory and raw materials associated with prior generation products, difficulty in predicting customer demand for new product and service offerings and effectively managing inventory levels so that they are in line with anticipated demand, risks associated with customer qualification, evaluation of new products, and the risk that new products may have quality or other defects or may not be supported adequately by application software. The introduction of new services and products by our competitors also may result in delays in customer purchases and difficulty in predicting customer demand. If we do not make an effective transition from existing services and products to future offerings, our revenues and margins may decline.
Furthermore, sales of our new services and products may replace sales, or result in discounting of some of our current product or service offerings, offsetting the benefits of a successful introduction. In addition, it may be difficult to ensure performance of new services and products in accordance with our revenue, margin and cost estimations and to achieve operational efficiencies embedded in our estimates. Given the competitive nature of the seismic industry, if any of these risks materializes, future demand for our services and products, and our future results of operations, may suffer.

Global economic conditions and credit market uncertainties could have an adverse effect on customer demand for certain of our services and products, which in turn would adversely affect our results of operations, our cash flows, our financial condition and our stock price.
Historically, demand for our services and products has been sensitive to the level of exploration spending by E&P companies and geophysical contractors. The demand for our services and products will be lessened if exploration expenditures by E&P companies are reduced. During periods of reduced levels of exploration for oil and natural gas, there have been oversupplies of seismic data and downward pricing pressures on our seismic services and products, which, in turn, have limited our ability to meet sales objectives and maintain profit margins for our services and products. In the past, these then-prevailing industry conditions have had the effect of reducing our revenues and operating margins. The markets for oil and gas historically have been volatile and may continue to be so in the future.
Turmoil or uncertainty in the credit markets and its potential impact on the liquidity of major financial institutions may have an adverse effect on our ability to fund our business strategy through borrowings under either existing or new debt facilities in the public or private markets and on terms we believe to be reasonable. Likewise, there can be no assurance that our customers will be able to borrow money for their working capital or capital expenditures on a timely basis or on reasonable terms, which could have a negative impact on their demand for our services and products and impair their ability to pay us for our services and products on a timely basis, or at all.
Our sales have historically been affected by interest rate fluctuations and the availability of liquidity, and we and our customers would be adversely affected by increases in interest rates or liquidity constraints. This could have a material adverse effect on our business, results of operations, financial condition and cash flows.
The loss of any significant customer or the inability of our customers to meet their payment obligations to us could materially and adversely affect our results of operations and financial condition.
Our business is exposed to risks related to customer concentration. In 2018, we had two customers (ExxonMobil and Petrobras) with sales that each exceeded 10% of our consolidated net revenues. In 2017, we had one customer with sales that exceeded 10% of our consolidated net revenues and no single customer represented 10% or more of our consolidated net revenues for 2016. Our top five customers together accounted for approximately 39%, 34% and 50%, of our consolidated net revenues during 2018, 2017 and 2016. The loss of any of our significant customers or deterioration in our relations with any of them could materially and adversely affect our results of operations and financial condition.
During the last ten years, our traditional geophysical contractor customers have been rapidly consolidating, thereby consolidating the demand for our services and products. The loss of any of our significant customers to further consolidation could materially and adversely affect our results of operations and financial condition.
Our business is exposed to risks of loss resulting from nonpayment by our customers. Many of our customers finance their activities through cash flow from operations, the incurrence of debt or the issuance of equity. Declines in commodity prices, and the credit markets could cause the availability of credit to be constrained. The combination of lower cash flow due to commodity prices, a reduction in borrowing bases under reserve-based credit facilities and the lack of available debt or equity financing may result in a significant reduction in our customers’ liquidity and ability to pay their obligations to us. Furthermore, some of our customers may be highly leveraged and subject to their own operating and regulatory risks, which increases the risk that they may default on their obligations to us. The inability or failure of our significant customers to meet their obligations to us or their insolvency or liquidity may adversely affect our financial results.
Our stock price has been volatile, declining and increasing from time to time.
The securities markets in general and our common stock in particular have experienced significant price and volume volatility in recent years. The market price and trading volume of our common stock may continue to experience significant fluctuations due not only to general stock market conditions but also to a change in sentiment in the market regarding our operations or business prospects or those of companies in our industry. In addition to the other risk factors discussed in this section, the price and volume volatility of our common stock may be affected by:
operating results that vary from the expectations of securities analysts and investors;
factors influencing the levels of global oil and natural gas exploration and exploitation activities, such as the decline in crude oil prices and depressed prices for natural gas in North America or disasters such as the Deepwater Horizon incident in the Gulf of Mexico in 2010;
the operating and securities price performance of companies that investors or analysts consider comparable to us;
actions by rating agencies related to the Notes;
announcements of strategic developments, acquisitions and other material events by us or our competitors; and

changes in global financial markets and global economies and general market conditions, such as interest rates, commodity and equity prices and the value of financial assets.
To the extent that the price of our common stock declines, our ability to raise funds through the issuance of equity or otherwise use our common stock as consideration will be reduced. A low price for our equity may negatively impact our ability to access additional debt capital. These factors may limit our ability to implement our operating and growth plans. In addition, the volatility in the market price of our common stock affects the value of our stock appreciation rights (“SARs”). To the extent that the price of our common stock increases, the value of our SARs will increase and could have a negative impact on our earnings and cash flows.
Goodwill, intangible assets and other long-lived assets (multi-client data library and property, plant and equipment and seismic rental equipment) that we have recorded are subject to impairment evaluations. In addition, our product inventory may become obsolete or excessive due to future changes in technology, changes in market demand, or changes in market expectations. Write-downs of these assets may adversely affect our financial condition and results of operations.
Reductions in or an impairment of the value of our goodwill, intangible assets and other long-lived assets will result in additional charges against our earnings, which could have a material adverse effect on our reported results of operations and financial position in future periods. At December 31, 2018, our remaining goodwill, intangible assets, multi-client data library and property, plant and equipment and seismic rental equipment balances were $22.9 million, $0.5 million, $73.5 million and $13.0 million, respectively. For 2018, we recognized an impairment of $36.6 million in property, plant and equipment for our cable-based ocean bottom acquisition technologies.
Our services and products’ technologies often change relatively quickly. Phasing out of old products involves estimating the amounts of inventories we need to hold to satisfy demand for those products and satisfy future repair part needs. Based on changing technologies and customer demand, we may find that we have either obsolete or excess inventory on hand. Because of unforeseen future changes in technology, market demand or competition, we might have to write off unusable inventory, which would adversely affect our results of operations.
Due to the international scope of our business activities, our results of operations may be significantly affected by currency fluctuations.
We derived approximately 75% of our 2018 consolidated net revenues from international sales, subjecting us to risks relating to fluctuations in currency exchange rates. Currency variations can adversely affect margins on sales of our products in countries outside of the United States and margins on sales of products that include components obtained from suppliers located outside of the United States. We operate in a wide variety of jurisdictions, including the United Kingdom, Brazil, Mexico, China, Canada, Russia, the United Arab Emirates, Egypt and other countries. Certain of these countries have experienced geopolitical instability, economic problems and other uncertainties from time to time. To the extent that world events or economic conditions negatively affect our future sales to customers in these and other regions of the world, or the collectability of receivables, our future results of operations, liquidity and financial condition may be adversely affected.
We currently require customers in certain higher risk countries to provide their own financing. We do not currently extend long-term credit through notes to companies in countries where we perceive excessive credit risk.
Our foreign subsidiaries receive their income and pay their expenses primarily in their local currencies. To the extent that transactions of these subsidiaries are settled in their local currencies, a devaluation of those currencies versus the U.S. dollar could reduce the contribution from these subsidiaries to our consolidated results of operations as reported in U.S. dollars. For financial reporting purposes, such depreciation will negatively affect our reported results of operations since earnings denominated in foreign currencies would be converted to U.S. dollars at a decreased value. In addition, since we participate in competitive bids for sales of certain of our services and products that are denominated in U.S. dollars, a depreciation of the U.S. dollar against other currencies could harm our competitive position relative to other companies. While we periodically employ economic cash flow and fair value hedges to minimize the risks associated with these exchange rate fluctuations, the hedging activities may be ineffective or may not offset more than a portion of the adverse financial impact resulting from currency variations. Accordingly, we cannot provide assurance that fluctuations in the values of the currencies of countries in which we operate will not materially adversely affect our future results of operations.

We rely on highly skilled personnel in our businesses, and if we are unable to retain or motivate key personnel or hire qualified personnel, we may not be able to effectively operate our business.
Our performance is largely dependent on the talents and efforts of highly skilled individuals. Our future success depends on our continuing ability to identify, hire, develop, motivate and retain skilled personnel for all areas of our organization. We require highly skilled personnel to operate and provide technical services and support for our businesses. Competition for qualified personnel required for our data processing operations and our other businesses has intensified recently. Our growth has presented challenges to us to recruit, train and retain our employees while managing the impact of potential wage inflation and the lack of available qualified labor in some markets where we operate. A well-trained, motivated and adequately-staffed work force has a positive impact on our ability to attract and retain business. Our continued ability to compete effectively depends on our ability to attract new employees and to retain and motivate our existing employees.
Certain of our facilities could be damaged by hurricanes and other natural disasters, which could have an adverse effect on our results of operations and financial condition.
Certain of our facilities are located in regions of the United States that are susceptible to damage from hurricanes and other weather events, and, during 2005, were impacted by hurricanes or other weather events. Our Devices group leases 144,000 square feet of facilities located in Harahan, Louisiana, in the greater New Orleans metropolitan area. In late August 2005, we suspended operations at these facilities and evacuated and locked down the facilities in preparation for Hurricane Katrina. These facilities did not experience flooding or significant damage during or after the hurricane. However, because of employee evacuations, power failures and lack of related support services, utilities and infrastructure in the New Orleans area, we were unable to resume full operations at the facilities until late September 2005. In August 2017, we lost use of our offices located in the Houston metropolitan area for several days, as a result of Hurricane Harvey.
Future hurricanes or similar natural disasters that impact our facilities may negatively affect our financial position and operating results for those periods. These negative effects may include reduced production, product sales and data processing revenues; costs associated with resuming production; reduced orders for our services and products from customers that were similarly affected by these events; lost market share; late deliveries; additional costs to purchase materials and supplies from outside suppliers; uninsured property losses; inadequate business interruption insurance and an inability to retain necessary staff. To the extent that climate change increases the severity of hurricanes and other weather events, as some have suggested, it could worsen the severity of these negative effects on our financial position and operating results.
Our operations, and the operations of our customers, are subject to numerous government regulations, which could adversely limit our operating flexibility. Regulatory initiatives undertaken from time to time, such as restrictions, sanctions and embargoes, can adversely affect, and have adversely affected, our customers and our business.
In addition to the specific regulatory risks discussed elsewhere in this Item 1A. “Risk Factors” section, our operations are subject to other laws, regulations, government policies and product certification requirements worldwide. Changes in such laws, regulations, policies or requirements could affect the demand for our products or services or result in the need to modify our services and products, which may involve substantial costs or delays in sales and could have an adverse effect on our future operating results. Our export activities in particular are subject to extensive and evolving trade regulations. Certain countries (including Russia) are subject to restrictions, sanctions and embargoes imposed by the United States government. These restrictions, sanctions and embargoes also prohibit or limit us from participating in certain business activities in those countries. In addition, our operations are subject to numerous local, state and federal laws and regulations in the United States and in foreign jurisdictions concerning the containment and disposal of hazardous materials, the remediation of contaminated properties, and the protection of the environment. These laws have been changed frequently in the past, and there can be no assurance that future changes will not have a material adverse effect on us. In addition, our customers’ operations are also significantly impacted by laws and regulations concerning the protection of the environment and endangered species. Consequently, changes in governmental regulations applicable to our customers may reduce demand for our services and products. To the extent that our customers’ operations are disrupted by future laws and regulations, our business and results of operations may be materially and adversely affected.
Offshore oil and gas exploration and development recently has been a regulatory focus. Future changes in laws or regulations regarding such activities, and decisions by customers, governmental agencies or other industry participants in response, could reduce demand for our services and products, which could have a negative impact on our financial position, results of operations or cash flows. We cannot reasonably or reliably estimate that such changes will occur, when they will occur, or whether they will impact us. Such changes can occur quickly within a region, which may impact both the affected region and global exploration and production, and we may not be able to respond quickly, or at all, to mitigate these changes. In addition, these future laws and regulations could result in increased compliance costs or additional operating restrictions that may adversely affect the financial health of our customers and decrease the demand for our services and products.
Existing or future laws and regulations related to greenhouse gases and climate change could have a material adverse effect on our business, results of operations, and financial condition.

Changes in environmental requirements related to greenhouse gases and climate change may negatively impact demand for our services. For example, oil and natural gas exploration and production may decline as a result of environmental requirements. Local, state, and federal agencies have been evaluating climate-related legislation and other regulatory initiatives that would restrict emissions of greenhouse gases in areas in which we conduct business. Because our business depends on the level of activity in the oil and natural gas industry, existing or future laws and regulations related to greenhouse gases and climate change, including incentives to conserve energy or use alternative energy sources, could have a negative impact on our business if such laws or regulations reduce demand for oil and natural gas.
We have outsourcing arrangements with third parties to manufacture some of our products. If these third party suppliers fail to deliver quality products or components at reasonable prices on a timely basis, we may alienate some of our customers and our revenues, profitability and cash flow may decline. Additionally, current global economic conditions could have a negative impact on our suppliers, causing a disruption in our vendor supplies. A disruption in vendor supplies may adversely affect our results of operations.
Our manufacturing processes require us to purchase quality components. In addition, we use contract manufacturers as an alternative to our own manufacturing of products. We have outsourced the manufacturing of our products, including our towed marine streamers, geophone manufacturing. Certain components used in our towed marine manufacturing operations are currently provided by a single supplier. Without these sole suppliers, we would be required to find other suppliers who could build these components for us, or set up to make these parts internally. If, in implementing any outsource initiative, we are unable to identify contract manufacturers willing to contract with us on competitive terms and to devote adequate resources to fulfill their obligations to us or if we do not properly manage these relationships, our existing customer relationships may suffer. In addition, by undertaking these activities, we run the risk that the reputation and competitiveness of our services and products may deteriorate as a result of the reduction of our control over quality and delivery schedules. We also may experience supply interruptions, cost escalations and competitive disadvantages if our contract manufacturers fail to develop, implement, or maintain manufacturing methods appropriate for our products and customers.
Reliance on certain suppliers, as well as industry supply conditions, generally involves several risks, including the possibility of a shortage or a lack of availability of key components, increases in component costs and reduced control over delivery schedules. If any of these risks are realized, our revenues, profitability and cash flows may decline. In addition, the more we come to rely on contract manufacturers, we may have fewer personnel resources with expertise to manage problems that may arise from these third-party arrangements.
Additionally, our suppliers could be negatively impacted by current global economic conditions. If certain of our suppliers were to experience significant cash flow issues or become insolvent as a result of such conditions, it could result in a reduction or interruption in supplies to us or a significant increase in the price of such supplies and adversely impact our results of operations and cash flows.
Our business is subject to cybersecurity risks and threats. 
Threats to our information technology systems associated with cybersecurity risk and cyber incidents or attacks continue to grow. It is also possible that breaches to our systems could go unnoticed for some period of time. Risks associated with these threats include, among other things, loss of intellectual property, disseminating of highly confidential information, impairment of our ability to conduct our operations, disruption of our customers’ operations, loss or damage to our customer data delivery systems, and increased costs to prevent, respond to or mitigate cybersecurity events.
Our certificate of incorporation and bylaws, Delaware law and certain contractual obligations under our agreement with BGP contain provisions that could discourage another company from acquiring us.
Provisions of our certificate of incorporation and bylaws, Delaware law and the terms of our investor rights agreement with BGP may have the effect of discouraging, delaying or preventing a merger or acquisition that our stockholders may consider favorable, including transactions in which you might otherwise receive a premium for shares of our common stock. These provisions include:
authorizing the issuance of “blank check” preferred stock without any need for action by stockholders;
providing for a classified board of directors with staggered terms;
requiring supermajority stockholder voting to effect certain amendments to our certificate of incorporation and bylaws;
eliminating the ability of stockholders to call special meetings of stockholders;
prohibiting stockholder action by written consent; and
establishing advance notice requirements for nominations for election to the board of directors or for proposing matters that can be acted on by stockholders at stockholder meetings.

In addition, the terms of our INOVA Geophysical joint venture with BGP and BGP’s investment in our company contain a number of provisions, such as certain pre-emptive rights granted to BGP with respect to certain future issuances of our stock, that could have the effect of discouraging, delaying or preventing a merger or acquisition of our company that our stockholders may otherwise consider to be favorable.
Failure to maintain effective internal controls in accordance with Section 404 of the Sarbanes-Oxley Act could have a material adverse effect on our stock price.
If, in the future, we fail to maintain the adequacy of our internal controls, as such standards are modified, supplemented or amended from time to time, we may not be able to ensure that we can conclude on an ongoing basis that we have effective internal controls over financial reporting in accordance with Section 404 of the Sarbanes-Oxley Act. Failure to achieve and maintain an effective internal control environment could have a material adverse effect on the price of our common stock.
Note: The foregoing factors pursuant to the Private Securities Litigation Reform Act of 1995 should not be construed as exhaustive. In addition to the foregoing, we wish to refer readers to other factors discussed elsewhere in this report are listedas well as other filings and reports with the SEC for a further discussion of risks and uncertainties that could cause actual results to differ materially from those contained in forward-looking statements. We undertake no obligation to publicly release the “Indexresult of any revisions to Consolidated Financial Statements” on page F-1 hereof.any such forward-looking statements, which may be made to reflect the events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.
(2)Item 1B. Financial Statement SchedulesUnresolved Staff Comments
The following financial statement schedule is listed in the “Index to Consolidated Financial Statements” on page F-1 hereof, and is includedNone.
Item 2. Properties
Our principal operating facilities at December 31, 2018 were as part of this Annual Report on Form 10-K:
Schedule II — Valuation and Qualifying Accounts
All other schedules are omitted because they are not applicable or the requested information is shown in the financial statements or noted therein.
(3)follows: Exhibits
Operating Facilities3.1Square
Footage


Segment
Houston, Texas3.2
4.1
4.2210,000
 Ocean Bottom Integrated Technologies
Harahan, Louisiana4.3144,000
 Devices group within Operations Optimization
Chertsey, England4.418,000
 E&P Technology & Services
Edinburgh, Scotland16,000
Optimization Software & Services group within Operations Optimization
 **10.1388,000
Each of these operating facilities is leased by us under long-term lease agreements. These lease agreements have terms that expire ranging from 2018 to 2030. See Footnote 14 “Operating Leases” of Footnotes to Consolidated Financial Statements.
In addition, we lease offices in Dubai, UAE; Beijing, China; Rio de Janeiro, Brazil; and Moscow, Russia to support our global sales force. We lease offices for our seismic data processing centers in Port Harcourt, Nigeria; Luanda, Angola; Cairo, Egypt; Villahermosa, Mexico; and Rio de Janeiro, Brazil. Our executive headquarters is located at 2105 CityWest Boulevard, Suite 100, Houston, Texas. The machinery, equipment, buildings and other facilities owned and leased by us are considered by our management to be sufficiently maintained and adequate for our current operations.
Form of Employee Stock Option Award Agreement for ARAM Systems Employee Inducement Stock Option Program, filed on November 14, 2008 as Exhibit 4.4 to the Company’s Registration Statement on Form S-8 (Registration No. 333-155378) and incorporated herein by reference.
Item 3. Legal Proceedings
WesternGeco
A more thorough treatment of history of this litigation is set forth above in Item 1.A, “Risk Factors”. As noted in that section, in 2014, because a jury found that we infringed four WesternGeco patents, the United States District Court for the Southern District of Texas (the “District Court”) entered a Final Judgment against us in the amount of $123.8 million ($12.5 million in reasonable royalties, $93.4 million in lost profits, $10.9 million in pre-judgment interest on lost profits, and $9.4 million in supplemental damages).
In 2015, the United States Court of Appeals for the Federal Circuit in Washington, D.C. (the “Court of Appeals”) reversed, in part, the District Court, holding that the lost profits, which were attributable to foreign seismic surveys, were not available to WesternGeco under the Patent Act. We had recorded a loss contingency accrual of $123.8 million because of the District Court’s ruling. As a result of the reversal by the Court of Appeals, we reduced the loss contingency accrual to $22.0 million.

On February 26, 2016, WesternGeco appealed the Court of Appeals’ decision to the Supreme Court, as to both lost profits and “enhanced” damages (damages which are available for willful infringement, and which neither the District Court nor the Trial Court awarded). On June 20, 2016, the Supreme Court vacated the Court of Appeals’ ruling, although it did not address lost profits at that time. Rather, in light of changes in case law regarding the standard of proof for willfulness in patent infringement, the Supreme Court remanded the case to the Court of Appeals for a determination of whether enhanced damages were appropriate.
On November 14, 2016, the District Court ordered our sureties to pay principal and interest on the royalty damages previously awarded. On November 25, 2016, we paid WesternGeco the $20.8 million due pursuant to the order, and reduced our loss contingency accrual to zero.
On March 14, 2017, the District Court held a hearing on whether impose additional damages for willfulness. The Judge found that our infringement was willful, and awarded enhanced damages of $5.0 million to WesternGeco (WesternGeco had sought $43.6 million in such damages.) The District Court also ordered the appeal bond to be released and discharged. The Court’s findings and ruling were memorialized in an order issued on May 16, 2017. On June 30, 2017, we and WesternGeco agreed that neither of us would appeal the District Court's award of $5.0 million in enhanced damages. Upon assessment of the enhanced damages, we accrued $5.0 million in the first quarter of 2017. As we have paid the $5.0 million, the accrual has been adjusted, and as of December 31, 2018, the loss contingency accrual was zero.
WesternGeco filed a second petition in the Supreme Court on February 17, 2017, appealing the lost profits issue again. On May 30, 2017, the Supreme Court called for the U.S. Solicitor General’s views on whether or not the Supreme Court ought to hear WesternGeco’s appeal. On December 6, 2017, the Solicitor General filed its brief, and took the position that the Supreme Court ought to hear the appeal and that foreign lost profits ought to be available. On January 12, 2018, the Supreme Court agreed to hear the appeal. The specific issue before the Supreme Court was whether lost profits arising from use of prohibited combinations occurring outside of the United States are categorically unavailable in cases where patent infringement is proven under 35 U.S.C. § 271(f)(2) (the statute under which we were held to have infringed WesternGeco’s patents, and upon which the District Court and Court of Appeals relied in entering their rulings).
The Supreme Court heard oral arguments on April 16, 2018. We argued that the Court of Appeals’ decision that eliminated lost profits ought to be affirmed. WesternGeco and the Solicitor General argued that the Court of Appeals’ decision that eliminated lost profits ought to be reversed.
On June 22, 2018, the Supreme Court reversed the judgment of the Court of Appeals, held that the award of lost profits to WesternGeco by the District Court was a permissible application of Section 284 of the Patent Act, and remanded the case back to the Court of Appeals for further proceedings consistent with its (the Supreme Court’s) opinion. On July 24, 2018, the Supreme Court issued the judgment that returned the case to the Court of Appeals.
On July 27, 2018, the Court of Appeals vacated its September 21, 2016 judgment with respect to damages, and ordered WesternGeco and us to submit supplemental briefing on what relief is appropriate in light of the Supreme Court’s decision. We and WesternGeco each submitted briefing in accordance with the Court of Appeals’ order (the last brief was filed on September 7, 2018).
We argued in our brief to the Court of Appeals that lost profits were not available to WesternGeco because the jury instructions required them to find that we had been WesternGeco’s direct competitor in the survey markets where WesternGeco had lost profits, and that the jury could not have found so. Additionally, we argued that the award of lost profits and reasonable royalties ought to be vacated and retried on separate grounds due to the outcome of an Inter Partes Review (“IPR”) filed with the Patent Trial and Appeal Board (“PTAB”) of the Patent and Trademark Office.
Until the Court of Appeals’ January 11, 2019 decision issued (which is described below), the IPR was an administrative proceeding that was separate from the 2009 lawsuit. By means of the IPR, we joined a challenge to the validity of several of WesternGeco’s patent claims that another company had filed. While the 2009 lawsuit was pending on appeal, the PTAB invalidated four of the six patent claims that formed the basis for the lawsuit judgment against us. WesternGeco appealed the PTAB’s invalidation of its patents to the Court of Appeals. On May 7, 2018, the Court of Appeals affirmed the PTAB’s invalidation of the patents, and on July 16, 2018, the Court of Appeals denied WesternGeco’s petition for a rehearing. On December 13, 2018, WesternGeco filed a petition with the Supreme Court, arguing that the Court of Appeals ought to have overturned the decision of the PTAB. (As of February 7, 2019, the Supreme Court has not indicated whether it will, or will not, hear WesternGeco’s appeal.)
In the same brief to the Court of Appeals in which we made our “direct competitor” argument, we argued that the Court of Appeals’ affirmation of the PTAB’s decision precluded WesternGeco’s damages claims, and that the Court of Appeals should order a new trial as to the royalty damages already paid by us. We also argued that if the Court of Appeals did not find our “direct competitor” argument persuasive, the Court should nonetheless vacate the District Court’s award of royalty damages and lost profits damages and order a new trial as to both royalty damages and lost profits.

In its briefs to the Court of Appeals, WesternGeco argued that the only remaining issue was whether lost profits were unavailable to WesternGeco due to our “direct competitor” argument, and argued that the invalidation of four of its six patent claims by the PTAB (which was affirmed by the Court of Appeals) should have no effect on lost profits or on the royalty award already paid by us. WesternGeco also argued that lost profits should be available notwithstanding our “direct competitor” argument.
Oral arguments took place on November 16, 2018, and on January 11, 2019, the Court of Appeals issued its ruling. In its ruling, the Court of Appeals refused to disturb the award of reasonable royalties to WesternGeco (which we paid in 2016), and rejected our “direct competitor” argument, but vacated the District Court’s award of lost profits damages and remanded the case back to the District Court to determine whether to hold a new trial as to lost profits. The Court of Appeals also ruled that its affirmance of the PTAB’s decision eliminated four of the five patent claims that could have supported the award of lost profits, leaving only one remaining patent claim that could support an award of lost profits.
The Court of Appeals further held that the lost profits award can be reinstated by the District Court if the existing trial record establishes that the jury must have found that the technology covered by the one remaining patent claim was essential for performing the surveys upon which lost profits were based. To make such a finding, the District Court must conclude that the present trial record establishes that there was no dispute that the technology covered by the one remaining patent claim, independent of the technology of the now-invalid claims, was required to perform the surveys. The Court of Appeals ruling further provides that if, but only if, the District Court concludes that WesternGeco established at trial, with undisputed evidence, that the remaining claim covers technology that was necessary to perform the surveys, then the District Court may deny a new trial and reinstate lost profits.
We may not ultimately prevail in the litigation and we could be required to pay some or all of the lost profits that were awarded by the District Court, plus interest, if the District Court denies a new trial on lost profits, or if a new trial is granted and a new judgment issues. Our assessment that we do not have a loss contingency may change in the future due to developments at the Supreme Court, Court of Appeals, or District Court, and other events, such as changes in applicable law, and such reassessment could lead to the determination that a significant loss contingency is probable, which could have a material effect on the Company’s business, financial condition and results of operations. The Company’s assessments disclosed in this Annual Report on Form 10-K or elsewhere are based on currently available information and involve elements of judgment and significant uncertainties.
Other Litigation
We have been named in various other lawsuits or threatened actions that are incidental to our ordinary business. Litigation is inherently unpredictable. Any claims against us, whether meritorious or not, could be time-consuming, cause us to incur costs and expenses, require significant amounts of management time and result in the diversion of significant operational resources. The results of these lawsuits and actions cannot be predicted with certainty. We currently believe that the ultimate resolution of these matters will not have a material adverse effect on our financial condition or results of operations.
Item 4. Mine Safety Disclosures
Not applicable.

PART II
Item 5.    Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Our common stock trades on the New York Stock Exchange (“NYSE”) under the symbol “IO.”
We have not historically paid, and do not intend to pay in the foreseeable future, cash dividends on our common stock. We presently intend to retain cash from operations for use in our business, with any future decision to pay cash dividends on our common stock dependent upon our growth, profitability, financial condition and other factors our board of directors consider relevant.
The terms of our Credit Facility contain covenants that restrict us from paying cash dividends on our common stock, or repurchasing or acquiring shares of our common stock, unless (i) there is no event of default under the Credit Facility, (ii) there is excess availability under the Credit Facility greater than $20.0 million (or, at the time that the borrowing base formula amount is less than $20.0 million, the borrowers’ level of liquidity (as defined in the Credit Facility) is greater than $20.0 million) and (iii) the agent receives satisfactory projections showing that excess availability under the Credit Facility for the immediately following period of ninety (90) consecutive days will not be less than $20.0 million (or, at the time that the borrowing base formula amount is less than $20.0 million, the borrowers’ level of liquidity is greater than $20.0 million). The aggregate amount of permitted cash dividends and stock repurchases may not exceed $10.0 million in any fiscal year or $40.0 million in the aggregate from and after the closing date of the Credit Facility.
The indenture governing the Second Lien Notes contains certain covenants that, among other things, limit our ability to pay certain dividends or distributions on our common stock or purchase, redeem or retire shares of our common stock, unless (i) no default under the indenture has occurred or would occur as a result of that payment, (ii) we would have, after giving pro forma effect to the payment, been permitted to incur at least $1.00 of additional indebtedness under a fixed charge coverage ratio test under the indenture, and (iii) the total cumulative amount of all such payments would not exceed a sum calculated by reference to, among other items, our consolidated net income, proceeds from certain sales of equity or assets, certain conversions or exchanges of debt for equity and certain other reductions in our indebtedness and in aggregate not to exceed at any one time $25.0 million.
On December 31, 2018, there were 567 holders of record of our common stock.
On November 30, 2018, the Company’s stockholders approved certain amendments to the Company’s Second Amended and Restated 2013 Long-term Incentive Plan (the “2013 LTIP”) including increasing the total number of shares of common stock available for issuance under the 2013 LTIP by 1.2 million shares, for a total of approximately 1.7 million shares, eliminating the restriction on the number of shares in the 2013 LTIP that can be issued as full value awards and certain other technical updates and clarifications related to Section 162(m) of the internal revenue code, as amended.
On February 21, 2018, in connection with the Public Equity Offering (as described in Footnote 12 “Stockholders' Equity and Stock-based Compensation” of Footnotes to the Consolidated Financial Statements), we issued and sold 1,820,000 shares of common stock at a public offering price of $27.50 per share, and warrants to purchase an additional 1,820,000 shares of the Company’s common stock. The net proceeds from this offering were $47.0 million, including transaction expenses. A portion of the net proceeds were used to retire the Company’s $28.5 million Third Lien Notes in March 2018 (several weeks before their maturity date). The warrants have an exercise price of $33.60 per share, are immediately exercisable and currently expire on March 21, 2019.
On December 14, 2017, in connection with the Equity Investment Program (as described in Footnote 12 “Stockholders' Equity and Stock-based Compensation” of Footnotes to the Consolidated Financial Statements), we sold, in a private placement under Section 4(a)(2) of the Securities Act of 1933, as amended, 120,567 shares of our common stock at $13.05 per share (the closing price of the our common stock on the NYSE on such date).
Item 6. Selected Financial Data
Special Items Affecting Comparability
The selected consolidated financial data set forth below under “Historical Selected Financial Data” with respect to our consolidated statements of operations for 2018, 2017, 2016, 2015 and 2014, and with respect to our consolidated balance sheets at December 31, 2018, 2017, 2016, 2015 and 2014, have been derived from our audited consolidated financial statements.
Our results of operations and financial condition have been affected by restructuring activities, legal contingencies, dispositions, debt refinancing and impairments and write-downs of assets during the periods presented, which affect the comparability of the financial information shown. In particular, our results of operations for the fiscal years ended December 31, 2014 – 2018 time period were impacted by the following items (before tax):

 Years Ended December 31,
 2018 2017 2016 2015 2014
 (In thousands)
Cost of sales:         
Write-down of multi-client data library$
 $(2,304) $
 $(399) $(100,100)
Write-down of excess and obsolete inventory$(665) $(398) $(429) $(151) $(6,952)
Operating expenses:         
Impairment of long-lived assets$(36,553) $
 $
 $
 $(23,284)
Write-down of receivables$
 $
 $
 $
 $(8,214)
Accelerated vesting and cash exercise of stock appreciation right awards$(2,105) $(6,141) $
 $
 $
Other income (expense):         
Reversal of (accrual for) loss contingency related to legal proceedings$
 $(5,000) $1,168
 $101,978
 $69,557
Gain on sale of Source product line$
 $
 $
 $
 $6,522
Gain on sale of cost method investments$
 $
 $
 $
 $5,463
Recovery of INOVA bad debts$
 $844
 $3,983
 $
 $
Loss on bond exchange$
 $
 $(2,182) $
 $
Equity in losses of INOVA investments$
 $
 $
 $
 $(49,485)
The historical selected financial data shown below should not be considered as being indicative of future operations, and should be read in conjunction with Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the consolidated financial statements and the notes thereto included elsewhere in this Form 10-K.
Historical Selected Financial Data
  Years Ended December 31,
  2018 2017 2016 2015 2014
  (In thousands, except for per share data)
Statement of Operations Data:          
Net revenues $180,045
 $197,554
 $172,808
 $221,513
 $509,558
Gross profit 59,620
 75,639
 36,032
 8,003
 62,223
Loss from operations (54,272) (8,699) (43,171) (100,632) (117,929)
Net loss applicable to common shares (71,171) (30,242) (65,148) (25,122) (128,252)
Net loss per basic share $(5.20) $(2.55) $(5.71) $(2.29) $(11.72)
Net loss per diluted share $(5.20) $(2.55) $(5.71) $(2.29) $(11.72)
Weighted average number of common shares outstanding 13,692
 11,876
 11,400
 10,957
 10,939
Weighted average number of diluted shares outstanding 13,692
 11,876
 11,400
 10,957
 10,939
Balance Sheet Data (end of year):        
Working capital $20,105
 $(8,628)
(a) 
$16,555
 $93,160
 $222,099
Total assets 244,749
 301,069
 313,216
 435,088
 617,257
Long-term debt (b)
 121,741
 156,744
 158,790
 182,992
 190,594
Total equity 7,824
 30,806
 53,398
 112,040
 135,712
Other Data:          
Investment in multi-client data library $28,276
 $23,710
 $14,884
 $45,558
 $67,785
Capital expenditures 1,514
 1,063
 1,488
 19,241
 8,264
Depreciation and amortization (other than multi-client data library) 8,763
 16,592
 21,975
 26,527
 27,656
Amortization of multi-client data library 48,988
 47,102
 33,335
 35,784
 64,374
(a)**10.2Working capital at December 31, 2017 is negative due to $28.5 million of Third Lien Notes (redeemed March 26, 2018) being reclassified from long-term to current.

(b)**10.3
**10.4
**10.5
10.6
long-term debt.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
Note: The following should be read in conjunction with our Consolidated Financial Statements and related Footnotes to Consolidated Financial Statements that appear elsewhere in this Annual Report on Form 10-K. References to “Footnotes” in the discussion below refer to the numbered Footnotes to Consolidated Financial Statements.
Executive Summary
Our Business
The terms “we,” “us” and similar or derivative terms refer to ION Geophysical Corporation and its consolidated subsidiaries, except where the context otherwise requires or as otherwise indicated.
We have been a technology leader for 50 years with a strong history of innovation. While the traditional focus of our cutting-edge technology has been on the E&P industry, we are now broadening and diversifying our business into relevant adjacent markets such as offshore logistics, military and marine robotics.
Leveraging innovative technologies, we create value through data capture, analysis and optimization to enhance companies’ critical decision-making abilities and returns. Our E&P offerings are focused on improving decision-making, enhancing reservoir management and optimizing offshore operations. We provide our services and products through three business segments – E&P Technology & Services, Operations Optimization and Ocean Bottom Integrated Technologies.
For a full discussion of our business, see Part I, Item 1. “Business.”
Macroeconomic Conditions
Demand for our services and products is cyclical and dependent upon activity levels in the oil and gas industry, particularly our customers’ willingness to invest capital in the exploration for oil and natural gas. Our customers’ capital spending programs are generally based on their outlook for near-term and long-term commodity prices, economic growth, commodity demand and estimates of resource production. Third-party reports now indicate that global exploration and production spending is expected to increase by 8% in 2019, consistent with 8% in 2018 and up from the 4% growth of 2017. This is an improvement from the double-digit declines sustained from 2014 to 2016. In addition, this is the second consecutive year that international spending is expected to increase, where our offerings are more relevant.
Shale production has dominated activity during the downturn due to its competitive break-even prices and short payback period compared to conventional exploration. However, we believe that investment in conventional resources during the next decade will be required to meet longer-term demand. We’re starting to see increasing pressure for a resumption in offshore investment and exploration activity to replace reserves.
The following is a summary of recent oil and gas pricing trends:
 Brent Crude (per bbl) West Texas Intermediate Crude (per bbl) Henry Hub Natural Gas (per mcf)
Quarter endedHigh Low High Low High Low
12/31/2018$86.07
 $50.57
 $76.40
 $44.48
 $4.70
 $3.10
9/30/2018$82.72
 $68.38
 $74.19
 $65.07
 $3.12
 $2.73
6/30/2018$80.42
 $66.04
 $77.41
 $62.03
 $3.08
 $2.74
3/31/2018$71.08
 $61.94
 $66.27
 $59.20
 $6.24
 $2.49
12/31/2017$66.80
 $55.29
 $60.46
 $49.34
 $3.69
 $2.60
9/30/2017$59.77
 $46.47
 $52.14
 $44.25
 $3.18
 $2.76
6/30/2017$55.05
 $43.98
 $53.38
 $42.48
 $3.27
 $2.85
3/31/2017$56.34
 $49.56
 $54.48
 $47.00
 $3.71
 $2.44
            
Source: EIA.        
Crude oil prices can be volatile due to a number of factors. Significant downward price volatility in Brent crude oil began late in 2014 and reached a low average of $33 per barrel in early 2016 before improving to approximately $55 per barrel by the end of 2016. The prices for Brent crude oil increased to an average of $71 per barrel for the full year 2018. This represents an $18 per barrel improvement over the average crude oil prices for the full year 2017 of $53. This price increase was due to robust global demand and sustained OPEC production cuts, the combination of which resulted in net inventory crude draws that reduced the overall crude surplus. Daily Brent crude oil spot prices reached a peak of $86 per barrel in October 2018, which was the highest level since October 2014, before falling to nearly $50 per barrel before the end of 2018. The price decrease in the latter part of 2018 reflected global oil inventory builds and record levels of production from the world’s three largest

producers - United States, Saudi Arabia and Russia. The EIA forecasts the Brent crude oil spot price will average $61 per barrel in 2019, $11 per barrel lower than 2018, resulting from concerns of oversupply and slower than expected pace of oil demand growth. In December 2018, OPEC and other non-OPEC participants such as Russia reached an agreement to cut their oil production for six months beginning January 2019 in response to increasing evidence that the global crude oil market could become oversupplied in 2019. This production cut is expected to keep global crude oil supply and demand in equilibrium, stabilizing prices. E&P spending is expected to increase over the near-term as crude oil prices are forecasted to remain more stable. In 2018, Mexico’s new President has announced that the Mexican government will not offer any new license rounds for the next three years while assuring that existing contracts will not be cancelled. In the medium-term, global crude oil demand is expected to continue growing while the oil & gas industry is predicted to face a supply crunch due to unsustainably low levels of exploration investments. As a result, E&P companies are expected to increase their focus on offshore oil exploration to replenish reserves.
Given the historical volatility of crude prices, there is a continued risk that if prices do not continue to improve, or if they start to decline again due to high levels of crude oil production, there is a potential for slowing growth rates in various global regions and/or for ongoing supply/demand imbalances. If commodity prices do not continue to improve, or if they start to deteriorate again, demand for our services and products could decline.
Impact to Our Business
While our 2018 revenues were down compared to 2017, we are seeing signs of increasing activity in our business, primarily due to the strategic shift we made to move our offerings closer to the reservoir and the associated continued success of our 3-D multi-client programs as well as clients starting to renew interest in conventional reserve replacement and offshore exploration. Historically, our revenue and EBITDA generation is lower in the first part of the year as customers tend to set budgets in the first quarter, firm up plans through the year, and spend excess budget in the fourth quarter. Investments in our multi-client data library are dependent upon the timing of our New Venture projects and the availability of underwriting by our customers. We continue to maintain high standards for underwriting new projects. Our asset light strategy enables us to scale our business to market conditions avoiding significant fixed costs and maintaining flexibility to manage the timing and amount of our capital expenditures.
In our E&P Technology & Services segment, our New Venture revenues experienced significant declines compared to 2017. In the current disciplined spending environment, many clients wait to purchase data associated with a license round until a formal public announcement has been made by the government. Delays in license round announcements can materially impact the timing of sales in areas where our New Venture programs are underway. Our under performance was driven by the continued delay of the Panama license round announcement, the three-year moratorium on new upstream licensing in Mexico and the continued focus on cash preservation within E&P companies restricting exploration spending. Imaging Services revenues increased as a result of an increase in proprietary ocean bottom nodal imaging projects. Our data library sales increased in 2018 compared to 2017 due to sales of the recently completed phase of the Mexico and Brazil reimaging programs, along with sales of 2-D data libraries in Libya. We invested $28.3 million in our multi-client data library during 2018, approximately $4.6 million and $13.4 million more compared to 2017 and 2016, respectively.
At December 31, 2018, our E&P Technology & Services segment backlog, which consists of commitments for (i) data processing work, (ii) New Venture projects (both multi-client and proprietary) by our Ventures group underwritten by our customers and (iii) E&P Advisors projects, decreased 44% to $21.9 million, compared with $39.2 million at December 31, 2017. The majority of our backlog relates to our 3-D multi-client reimaging programs offshore Brazil and our proprietary Imaging Services and E&P Advisors work. We anticipate that the majority of our backlog will be recognized as revenue over the first half of 2019.
Within the Operations Optimization segment, the increase in Optimization Software & Services revenues was due to continued increase in sales of our Gator ocean bottom command and control system. Devices revenues continue to be impacted by reduced towed streamer seismic contractor activity and cash preservation focus.
We have continued to evolve our strategy for our Ocean Bottom Integrated Technologies segment consistent with our asset light business model. The remaining elements of our next generation ocean bottom nodal system, 4Sea, will be commercialized in 2019. We are offering 4Sea components more broadly to the growing number of OBS service providers under recurring revenue commercial strategies that will enable us to share in the value our technology delivers. We may also license the right to manufacture and use the fully integrated system to a service provider on a value-based pricing model, such as a royalty stream. Such licensing would be recognized through the relevant segment, either E&P Technology & Services or Operations Optimization. While not our primary route to market, we continue to evaluate acquisition projects on a case-by-case basis that meet our long-term risk and return thresholds. In 2018, we recognized a write down of $36.6 million for our cable-based ocean bottom acquisition technologies. We continue to see significant long-term potential for our technologies to improve OBS safety, efficiency and data quality, and we expect demand for OBS surveys to continue increasing.

It is our view that technologies that add a competitive advantage through improved imaging, lower costs, higher productivity, or enhanced safety will continue to be valued in our marketplace. We believe that our newest technologies, such as Marlin and 4Sea, will continue to attract customer interest, because these technologies are designed to deliver those desirable attributes.
Key Financial Metrics
The tables below provide (i) a summary of our net revenues for our company as a whole, and by segment, for 2018, 2017 and 2016, and (ii) an overview of other certain key financial metrics for our company as a whole and our three business segments on a comparative basis for 2018, 2017 and 2016, as reported and as adjusted in all three years for the special items recorded for those years.
 Years Ended December 31,
 2018 2017 2016
 (In thousands)
Net revenues:     
E&P Technology & Services:     
New Venture$69,685
 $100,824
 $27,362
Data Library47,095
 40,016
 39,989
Total multi-client revenues116,780
 140,840
 67,351
Imaging Services19,740
 16,409
 25,538
Total$136,520
 $157,249
 $92,889
Operations Optimization:     
Devices$22,396
 $23,610
 $26,746
Optimization Software & Services21,129
 16,695
 16,756
Total$43,525
 $40,305
 $43,502
Ocean Bottom Integrated Technologies$
 $
 $36,417
Total$180,045
 $197,554
 $172,808

 Year Ended December 31, 2018 Year Ended December 31, 2017 Year Ended December 31, 2016
 As Reported Special Items As Adjusted As Reported Special Items As Adjusted As Reported Special Items As Adjusted
 (In thousands, except per share data)
Gross profit:                 
E&P Technology & Services$43,369
 $
 $43,369
 $65,196
 $
 $65,196
 $4,708
 $766
 $5,474
Operations Optimization22,293
 
 22,293
 20,076
 
 20,076
 21,745
 188
 21,933
Ocean Bottom Integrated Technologies(6,042) 
 (6,042) (9,633) 
 (9,633) 9,579
 123
 9,702
Total$59,620
 $
 $59,620
 $75,639
 $
 $75,639
 $36,032

$1,077
(d) 
$37,109
Gross margin:                 
E&P Technology & Services32 % % 32 % 41 % % 41 % 5 % 1% 6 %
Operations Optimization51 % % 51 % 50 % % 50 % 50 % % 50 %
Ocean Bottom Integrated Technologies % %  %  % %  % 27 % % 27 %
Total33 % % 33 % 38 % % 38 % 21 % % 21 %
Income (loss) from operations:                 
E&P Technology & Services$21,758
 $
 $21,758
 $42,505
 $
 $42,505
 $(16,446) $1,128
 $(15,318)
Operations Optimization7,295
 
 7,295
 8,022
 
 8,022
 9,652
 197
 9,849
Ocean Bottom Integrated Technologies(47,644) 36,553
(a) 

(11,091) (16,259) 
 (16,259) (1,756) 504
 (1,252)
Support and other(35,681) 2,105
(b) 
(33,576) (42,967) 6,141
(b) 
(36,826) (34,621) 180
 (34,441)
Total$(54,272) $38,658
 $(15,614) $(8,699) $6,141
 $(2,558) $(43,171) $2,009
(d) 
$(41,162)
Operating margin:                 
E&P Technology & Services16 % % 16 % 27 % % 27 % (18)% 2% (16)%
Operations Optimization17 % % 17 % 20 % % 20 % 22 % 1% 23 %
Ocean Bottom Integrated Technologies % %  %  % %  % (5)% 2% (3)%
Support and other(20)% 1% (19)% (22)% 3% (19)% (20)% % (20)%
Total(30)% 21% (9)% (4)% 3% (1)% (25)% 1% (24)%
Net income (loss) applicable to common shares$(71,171) $38,658
 $(32,513) $(30,242) $11,141
(c) 
$(19,101) $(65,148) $(960)
(e) 
$(66,108)
Diluted net income (loss) per common share$(5.20) $2.83
 $(2.37) $(2.55) $0.94
 $(1.61) $(5.71) $(0.09) $(5.80)
        

(a)10.7
10.8
10.9
**10.10
**10.11
**10.12
**10.13
10.14
10.15
10.16
**10.17
**10.18
**10.19
**10.20
**10.21
21.1
*23.1
*31.1
*31.2
*32.1
*32.2

101
The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets at December 31, 2017 and 2016, (ii) Consolidated Statements of Operations for the years ended December 31, 2017, 2016 and 2015, (iii) Comprehensive Income (Loss) for the years ended December 31, 2017, 2016 and 2015, (iv) Consolidated Statements of Cash Flows for the years ended December 31, 2017, 2016 and 2015, (v) Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2017, 2016 and 2015, (vi) Footnotes to Consolidated Financial Statements and (vii) Schedule II – Valuation and Qualifying Accounts.cable-based ocean bottom acquisition technologies.
    
*Filed herewith.
**Management contract or compensatory plan or arrangement.
(b)Exhibits required by Item 601
Represents accelerated vesting and cash exercise of Regulation S-K.
Reference is made to subparagraph (a) (3) of this Item 15, which is incorporated herein by reference.
(c)Not applicable.
stock appreciation right awards.

SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Houston, State of Texas, on February 9, 2018.
ION GEOPHYSICAL CORPORATION
By/s/ R. Brian Hanson
   R. Brian Hanson
(c)In addition to item (b), also impacting net loss applicable to common shares was a loss contingency accrual of $5.0 million related to legal proceedings.
   President
(d)Represents severance and Chief Executive Officerfacility charges related to the Company’s 2016 restructuring.
(e)Represents a $3.9 million recovery of INOVA bad debts, partially offset by item (d).


        

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIESWe intend that the following discussion of our financial condition and results of operations will provide information that will assist in understanding our consolidated financial statements, the changes in certain key items in those financial statements from year to year, and the primary factors that accounted for those changes.
INDEX TO CONSOLIDATED FINANCIAL STATEMENTSFor a discussion of factors that could impact our future operating results and financial condition, see Item 1A. “Risk Factors” above.
Results of Operations
Year Ended December 31, 2018 (As Adjusted) Compared to Year Ended December 31, 2017 (As Adjusted)
Our total net revenues of $180.0 million for 2018 decreased $17.6 million, or 9%, compared to total net revenues of $197.6 million for 2017. Our overall gross profit percentage for 2018 was 33%, compared to a gross profit percentage of 38% for 2017. Total operating expenses as a percentage of total net revenues for 2018 and 2017 were 42% and 40%, as adjusted, respectively. During 2018, our loss from operations was $15.6 million, as adjusted, compared to a loss of $2.6 million, as adjusted, for 2017.
Our net loss for 2018 was $32.5 million, as adjusted, or $(2.37) per share, compared to net loss of $19.1 million, as adjusted, or $(1.61) per share for 2017. As noted above, our net loss for 2018 and 2017 included other special items totaling $38.7 million and $11.1 million, respectively, impacting our loss per share by $2.83 and $0.94, respectively.
Net Revenues, Gross Profits and Gross Margins
E&P Technology & Services — Net revenues for 2018 decreased by $20.7 million, or 13%, to $136.5 million, compared to $157.2 million for 2017. Within the E&P Technology & Services segment, total multi-client revenues were $116.8 million, a decrease of 17%, with New Venture revenues experiencing significant declines during 2018. Partially offsetting the overall decline in New Venture revenues was an increase in Data Library revenues, attributable to sales of the recently completed phases of the Brazil and Mexico reimaging programs, along with sales of 2-D data libraries in Libya. The decrease in multi-client revenues was driven by the continued delay of the Panama license round announcement, the deferment of new E&P investments in Mexico and the continued focus on cash preservation within E&P companies restricting exploration spending. Imaging Services revenues were $19.7 million, a 20%increase, due to an increase in proprietary ocean bottom nodal imaging projects. 
Gross profit decreased by $21.8 million to $43.4 million, representing a 32% gross margin, compared to $65.2 million, or 41% gross margin, for 2017. The decline in gross profit and margin were due to the decrease in New Venture revenues partly offset by the increases in Data Library and Imaging Services revenues, as noted above.
Operations Optimization — Net revenues for 2018 increased by $3.2 million, or 8%, to $43.5 million, compared to $40.3 million for 2017. Optimization Software & Services net revenues increased by $4.4 million, or 26%, to $21.1 million, compared to $16.7 million for 2017 due to increase in sales of our Gator ocean bottom command and control system. Devices revenues for 2018 decreased by $1.2 million, or 5%, to $22.4 million, compared to $23.6 million for 2017. This decrease was due to a decline in our repairs business due to seismic contractors focus on cash preservation and decrease in sales of our various product offerings. Operations Optimization gross profit for 2018 increased by $2.2 million to $22.3 million, in 2018, compared to $20.1 million, for 2017. Gross margin increased to 51% in 2018 from 50% in 2017.
Ocean Bottom Integrated Technologies — Net revenues for both 2018 and 2017 were zero. In line with our component strategy, revenues for the elements of fully integrated 4Sea system will be recognized in the relevant segment, either E&P Technology & Services or Operations Optimization. Gross loss was $6.0 million for 2018 compared to gross loss of $9.6 million for 2017. This decline was due to reduced depreciation expense as some assets were fully depreciated in late 2017 and early 2018.
Operating Expenses (As Adjusted)
The following table presents the “As Adjusted” in both 2018 and 2017, excluding other special items (in thousands):

 Year Ended December 31, 2018 Year Ended December 31, 2017
 As Reported Special Items As Adjusted As Reported Special Items As Adjusted
Operating expenses:           
Research, development and engineering$18,182
 $
 $18,182
 $16,431
 $
 $16,431
Marketing and sales21,793
 
 21,793
 20,778
 
 20,778
General, administrative and other operating expenses37,364
 (2,105)
(a) 

35,259
 47,129
 (6,141)
(a) 

40,988
Impairment of long-lived assets36,553
 (36,553)
(b) 


 
 
 
Total operating expenses$113,892
 $(38,658) $75,234
 $84,338
 $(6,141) $78,197
(a)
Represents accelerated vesting and cash exercise of stock appreciation rights awards.
(b)
Page
ION Geophysical Corporation and Subsidiaries:
ReportsRepresents a write-down of Independent Registered Public Accounting FirmsF-2
Consolidated Balance Sheets — December 31, 2017 and 2016F-3
Consolidated Statements of Operations — Years ended December 31, 2017, 2016 and 2015F-4
Consolidated Statements of Comprehensive Income (Loss) — Years ended December 31, 2017, 2016 and 2015F-5
Consolidated Statements of Cash Flows — Years ended December 31, 2017, 2016 and 2015F-6
Consolidated Statements of Stockholders’ Equity — Years ended December 31, 2017, 2016 and 2015F-7
Footnotes to Consolidated Financial StatementsF-8
Schedule II — Valuation and Qualifying AccountsS-1the cable-based ocean bottom acquisition technologies.
Research, Development and Engineering — Research, development and engineering expense increased $1.8 million, or 11%, to $18.2 million, for 2018, compared to $16.4 million, for 2017. Increase is primarily driven by increased employment costs as we continue to invest in imaging algorithms and infrastructure, devices and software. We see significant long-term potential for investing in technologies that improve image quality, safety and productivity.


Marketing and Sales — Marketing and sales expense increased $1.0 million, or 5%, to $21.8 million, for 2018, compared to $20.8 million, for 2017. This increase was primarily due to increased marketing expenses to broaden and diversify our offerings into adjacent markets including consulting fees, partly offset by decrease in commission expense.
ReportGeneral, Administrative and Other Operating Expenses — General, administrative and other operating expenses decreased $5.7 million, or 14%, to $35.3 million, as adjusted, for 2018 compared to $41.0 million, as adjusted, for 2017. The decrease was driven by reductions in bonus expense due to current operating results.
Other Items
Interest Expense, net — Interest expense, net, of Independent Registered Public Accounting Firm$13.0 million for 2018 compared to $16.7 million for 2017. The decrease in interest expense was a result of lower outstanding debt during 2018. For additional information, please refer to “— Liquidity and Capital Resources — Sources of Capital” below.

Other Expense — Other expense for 2018 was $0.4 million compared to other expense of $3.9 million for 2017. The difference primarily relates to changes in our accrual for loss contingency related to the WesternGeco legal proceedings. See further discussion at Footnote 8 “Legal Matters” and in Part 1, Item 3, “Legal Proceedings.
BoardThe following table reflects the significant items of Directorsother income (in thousands):
 Years Ended December 31,
 2018 2017
Accrual for contingency related to legal proceedings (Footnote 8)$
 $(5,000)
Recovery of INOVA bad debts
 844
Other income (expense)(436) 211
Total other income (expense)$(436) $(3,945)
Income Tax Expense — Income tax expense for 2018 was $2.7 million compared to less than $0.1 million for 2017. Our effective tax rates for 2018 and Stockholders
ION Geophysical Corporation

Opinion on2017 were 4.0% and 0.1%, respectively. The income tax expense for 2018 and 2017 primarily relates to profits generated by our non-U.S. businesses. Tax expense for 2018 and 2017 includes a $0.3 million and $1.3 million, respectively tax benefit for the financial statements
We have audited the accompanying consolidated balance sheets of ION Geophysical Corporation (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2017 and 2016, the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows for eachrelease of the three yearsvaluation allowance against refundable U.S. alternative minimum tax (“AMT”) credits. Tax expense has not been offset by the tax benefits on losses within the U.S. and other jurisdictions, from which we cannot currently benefit. Our effective tax rate for 2018 was negatively impacted by the change in the period ended December 31, 2017, and thevaluation allowance related notes and schedule (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial positionU.S. operating losses for which we cannot currently recognize a tax benefit. See further discussion of establishment of the Company as deferred tax valuation allowance at Footnote 7 “Income Taxesof December 31, 2017 and 2016, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity with accounting principles generally accepted in the United States of America.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2017, based on criteria established in the 2013Footnotes to Internal Control-Integrated FrameworkConsolidated Financial Statements. issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated February 8, 2018 expressed an unqualified opinion.
Basis for opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.


/s/ GRANT THORNTON LLP

We have served as the Company’s auditor since 2014

Houston, Texas
February 8, 2018

        

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIESResults of Operations
CONSOLIDATED BALANCE SHEETSYear Ended December 31, 2017 (As Adjusted) Compared to Year Ended December 31, 2016 (As Adjusted)

Our total net revenues of $197.6 million for 2017 increased $24.8 million, or 14%, compared to total net revenues of $172.8 million for 2016. Our overall gross profit percentage for 2017 was 38%, compared to a gross profit percentage of 21%, as adjusted, for 2016. Total operating expenses as a percentage of net revenues for 2017 and 2016 were 40% and 45%, as adjusted, respectively. During 2017, our loss from operations was $2.6 million, as adjusted, compared to a loss of $41.2 million, as adjusted, for 2016.
Our net loss for 2017 was $19.1 million, as adjusted, or $(1.61) per share, compared to net loss of $66.1 million, as adjusted, or $(5.80) per share for 2016. As noted above, our net loss for 2017 and 2016 included restructuring charges and other special items totaling $11.1 million and $(1.0) million, respectively, impacting our earnings per share by $0.94 and $(0.09), respectively.
Net Revenues, Gross Profits and Gross Margins (As Adjusted for 2016)
E&P Technology & Services — Net revenues for 2017 increased by $64.4 million, or 69%, to $157.2 million, compared to $92.9 million for 2016. Within the E&P Technology & Services, total multi-client revenues were $140.8 million, an increase of 109%, driven by New Venture revenues from our 3-D multi-client reimaging programs offshore Mexico and Brazil, as well as revenues from a new 2-D multi-client program in Panama and other programs that have recently been launched. Imaging Services revenues were $16.4 million, a decrease of 36%, as result of the shift towards higher return multi-client programs during 2017. Revenues from Data Library sales were consistent year over year.
Gross profit increased by $59.7 million to $65.2 million, representing a 41% gross margin, compared to $5.5 million, as adjusted, or 6% gross margin, for 2016. These improvements in gross profit and margin were due to the increase in revenues and the mix of higher margin 3-D reimaging programs as noted above, as well as the full benefit of our cost control initiatives implemented in prior years. These increases were partially offset by higher sales-based amortization of our multi-client data library.
Operations Optimization — Net revenues for 2017 decreased by $3.2 million or 7% to $40.3 million compared to $43.5 million for 2016. Devices net revenues for 2017 decreased by $3.1 million, or 12%, to $23.6 million, compared to $26.7 million for 2016. This decrease was due to a decline in our repairs business, partially offset by sales of new product offerings during 2017. Optimization Software & Services net revenues remained flat at $16.7 million. Excluding the effect of foreign currencies, Optimization Software & Services revenues were up 4% in terms of local GBP currency. Operations Optimization gross profit for 2017 decreased by $1.9 million to $20.0 million, in 2017, compared to $21.9 million, as adjusted, for 2016. Gross margin remained flat at 50%.
Ocean Bottom Integrated Technologies — Net revenues for 2017 were zero compared to $36.4 million for 2016. The crew was idle throughout 2017 as we pursued additional OBS work. Gross loss was $9.6 million for 2017 compared to gross income of $9.7 million, as adjusted, for 2016. This decline was due to the decrease in revenues, partially offset by several cost control initiatives implemented in 2017, including the renegotiation of our vessel leases, which reduced our vessel lease costs.
Operating Expenses (As Adjusted)
The following table presents the “As Adjusted” in both 2017 and 2016, excluding other special items (in thousands):
 December 31,
 2017 2016
 (In thousands, except share data)
ASSETS
Current assets:   
Cash and cash equivalents$52,056
 $52,652
Accounts receivable, net19,478
 20,770
Unbilled receivables37,304
 13,415
Inventories14,508
 15,241
Prepaid expenses and other current assets7,643
 9,559
Total current assets130,989
 111,637
Deferred income tax asset1,753
 
Property, plant, equipment and seismic rental equipment, net52,153
 67,488
Multi-client data library, net89,300
 105,935
Goodwill24,089
 22,208
Intangible assets, net1,666
 3,103
Other assets1,119
 2,845
Total assets$301,069
 $313,216
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:   
Current maturities of long-term debt$40,024
 $14,581
Accounts payable24,951
 26,889
Accrued expenses38,697
 26,240
Accrued multi-client data library royalties27,035
 23,663
Deferred revenue8,910
 3,709
Total current liabilities139,617
 95,082
Long-term debt, net of current maturities116,720
 144,209
Other long-term liabilities13,926
 20,527
Total liabilities270,263
 259,818
Equity:   
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 12,019,701 and 11,792,447 shares at December 31, 2017 and 2016, respectively.120
 118
Additional paid-in capital903,247
 899,198
Accumulated deficit(854,921) (824,679)
Accumulated other comprehensive loss(18,879) (21,748)
Total stockholders’ equity29,567
 52,889
Noncontrolling interests1,239
 509
Total equity30,806
 53,398
Total liabilities and equity$301,069
 $313,216
 Year Ended December 31, 2017 Year Ended December 31, 2016
 As Reported 
Special Items(b)
 As Adjusted As Reported 
Special Items(a)
 As Adjusted
Operating expenses:           
Research, development and engineering$16,431
 $
 $16,431
 $17,833
 $(397) $17,436
Marketing and sales20,778
 
 20,778
 17,371
 (262) 17,109
General, administrative and other operating expenses47,129
 (6,141) 40,988
 43,999
 (273) 43,726
Total operating expenses$84,338
 $(6,141) $78,197
 $79,203
 $(932) $78,271
Income (loss) from operations$(8,699) $6,141
 $(2,558) $(43,171) $2,009
 $(41,162)
(a)
Includes severance affecting operating expenses.
(b)
Represents accelerated vesting and cash exercise of stock appreciation rights awards.

Research, Development and Engineering — Research, development and engineering expense decreased $1.0 million, or 6%, to $16.4 million, for 2017, compared to $17.4 million, as adjusted, for 2016. During the current down-cycle in E&P exploration spending, we have been selective in spending on research and development (“R&D”) projects in order to reduce expenses without sacrificing our ability to develop our technologies. As discussed above, despite the extended market downturn and uncertainty, we see significant long-term potential for our technologies to improve OBS productivity. We continue to invest in our 4Sea system and we expect long-term demand for OBS production surveys (4-D) to increase.
Marketing and Sales —Marketing and sales expense increased $3.7 million, or 22%, to $20.8 million, for 2017, compared to $17.1 million, as adjusted, for 2016. This increase was primarily due to higher commissions driven by increased sales in the E&P Technology & Services segment.
General, Administrative and Other Operating Expenses — General, administrative and other operating expenses decreased $2.7 million, as adjusted, or 6%, to $41.0 million, as adjusted for 2017 compared to $43.7 million, as adjusted, for 2016. This decrease for 2017 was primarily due to the full benefit of our cost control initiatives implemented in prior years.
Other Items
Interest Expense, net — Interest expense, net, of $16.7 million for 2017 compared to $18.5 million for 2016. This improvement was primarily due to reduced debt caused by the bond exchange during 2016. For additional information, please refer to “— Liquidity and Capital Resources — Sources of Capital” below.
Other Income (Expense) — Other income (expense) for 2017 was $(3.9) million compared to other income of $1.4 million for 2016. The difference primarily relates to changes in our accrual for loss contingency related to a legal matter. See accompanyingfurther discussion at Footnote 8 “Legal Matters” and in Part 1, Item 3, “Legal Proceedings.
The following table reflects the significant items of other income (in thousands):
 Years Ended December 31,
 2017 2016
Reduction of (accrual for) loss contingency related to legal proceedings (Footnote 8)$(5,000) $1,168
Recovery of INOVA bad debts844
 3,983
Loss on bond exchange
 (2,182)
Other expense211
 (1,619)
Total other income$(3,945) $1,350
Income Tax Expense — Income tax expense for 2017 was less than $0.1 million compared to $4.4 million for 2016. Our effective tax rates for 2017 and 2016 were (0.1)% and (7.3)%, respectively. The income tax expense for 2017 and 2016 primarily relates to results generated by our non-U.S. businesses. Tax expense for 2017 includes a $1.3 million tax benefit for the release of the valuation allowance against refundable U.S. alternative minimum tax (“AMT”) credits. Tax expense has not been offset by the tax benefits on losses within the U.S. and other jurisdictions, from which we cannot currently benefit. Our effective tax rate for 2017 was negatively impacted by the change in valuation allowance related to U.S. operating losses for which we cannot currently recognize a tax benefit. See further discussion of establishment of the deferred tax valuation allowance at Footnote 7 “Income Taxesof Footnotes to Consolidated Financial Statements.
Liquidity and Capital Resources
Sources of Capital
As of December 31, 2018, we had total liquidity of $75.5 million, consisting of $33.6 million in cash on hand and $41.9 million of available borrowing capacity under the Credit Facility. Our cash requirements include working capital requirements and cash required for our debt service payments, multi-client seismic data acquisition activities and capital expenditures. As of December 31, 2018, we had working capital of $20.1 million. Working capital requirements are primarily driven by our investment in our (i) multi-client data library ($28.3 million in 2018) and royalty payments for multi-client sales. Also, our headcount has traditionally been a significant driver of our working capital needs. As a significant portion of our business is involved in the planning, processing and interpretation of seismic data, one of our largest investments is in our employees, which involves cash expenditures for their salaries, bonuses, payroll taxes and related compensation expenses, typically in advance of related revenue billings and collections.
Our working capital requirements may change from time to time depending upon many factors, including our operating results and adjustments in our operating plan in response to industry conditions, competition and unexpected events. In recent years, our primary sources of funds have been cash flows generated from operations, existing cash balances, debt and equity issuances and borrowings under our revolving credit facility.

Public Equity Offering and Retirement of Debt
On February 21, 2018, we announced our successful completion of a public equity offering to begin de-levering our balance sheet.  We issued and sold 1,820,000 shares of common stock at a public offering price of $27.50 per share, and warrants to purchase an additional 1,820,000 shares of our common stock. The net proceeds from this offering were $47.0 million, including transaction expenses. A portion of the net proceeds were used to retire our $28.5 million Third Lien Notes in March 2018 (several weeks before their maturity date). The warrants have an exercise price of $33.60 per share, are immediately exercisable and expire on March 21, 2019.
Equity Investment Program
To encourage our executive officers and other key employees to purchase our common stock and further align their interests with those of our stockholders, the Board authorized and approved an equity investment program pursuant to which certain of our executive officers and other key employees are permitted, but not obligated, to purchase unregistered shares of our common stock directly from the Company at market prices. In connection with any such purchases, the Committee authorized and approved, on December 13, 2017, a grant by us to such purchasing executive officers and key employees of a certain number of shares of restricted stock. On December 13, 2017, the Committee also authorized and approved to grant to certain executive officers and key employees a certain number of shares of restricted stock in connection with certain purchases of shares of our common stock in the open market.
On December 14, 2017, we sold, in a private placement under Section 4(a)(2) of the Securities Act of 1933, as amended, 120,567 shares of our common stock at $13.05 per share (the closing price of the our common stock on the NYSE on such date) and executive officers and other key employees purchased 219,346 shares in the open market.
Revolving Credit Facility
On August 16, 2018, we and our material U.S. subsidiaries; GX Technology Corporation, ION Exploration Products (U.S.A) and I/O Marine Systems, Inc. (the “Material U.S. Subsidiaries”), along with GX Geoscience Corporation, S. de R.L. de C.V., a limited liability company (Sociedad de Responsibilidad Limitada de Capital Variable) organized under the laws of Mexico, and a subsidiary of the Company (the “Mexican Subsidiary,”) (the Material U.S. Subsidiaries and the Mexican Subsidiary are collectively, the “Subsidiary Borrowers”, together with ION Geophysical Corporation are the “Borrowers”), the financial institutions party thereto, as lenders, and PNC Bank, National Association (“PNC”), as agent for the lenders, entered into that certain Third Amendment and Joinder to Revolving Credit and Security Agreement (the “Third Amendment”), amending the Revolving Credit and Security Agreement, dated as of August 22, 2014 (as previously amended by the First Amendment to Revolving Credit and Security Agreement, dated as of August 4, 2015 and the Second Amendment to Revolving Credit and Security Agreement, dated as of April 28, 2016, the “Credit Agreement”). The Credit Agreement, as amended by the First Amendment, the Second Amendment and the Third Amendment is herein called, the “Credit Facility”). 
The Third Amendment amends the Credit Agreement to, among other things:
extend the maturity date of the Credit Facility by approximately four years (from August 22, 2019 to August 16, 2023), subject to the retirement or extension of the maturity date of the Second Lien Notes, as defined below, which mature on December 15, 2021;
increase the maximum revolver amount by $10 million (from $40 million to $50 million);
increase the borrowing base percentage of the net orderly liquidation value as it relates to the multi-client data library (not to exceed $28.5 million, up from the previous maximum of $15 million for the multi-client data library component);
include the eligible billed receivables of the Mexican Subsidiary up to a maximum of $5 million in the borrowing base calculation and joins the Mexican Subsidiary as a borrower thereunder (with a maximum exposure of $5 million) and require the equity and assets of the Mexican Subsidiary to be pledged to secure obligations under the Credit Facility;
modify the interest rate such that the maximum interest rate remains consistent with the fixed interest rate prior to the Third Amendment (that is, 3.00% per annum for domestic rate loans and 4.00% per annum for LIBOR rate loans), but now lowers the range down to a minimum interest rate of 2.00% for domestic rate loans and 3.00% for LIBOR rate loans based on a leverage ratio for the preceding four-quarter period;
decrease the minimum excess borrowing availability threshold which (if the Borrowers have minimum excess borrowing availability below any such threshold) triggers the agent’s right to exercise dominion over cash and deposit accounts; and
modify the trigger required to test for compliance with the fixed charge coverage ratio.
The borrowing base under the Credit Facility will increase or decrease monthly using a formula based on certain eligible receivables, eligible inventory and other amounts, including a percentage of the net orderly liquidation value of our multi-client

data library. As of December 31, 2018, the borrowing base under the Credit Facility was $41.9 million, and there was no outstanding indebtedness under the Credit Facility.
The Credit Facility requires us to maintain compliance with various covenants. At December 31, 2018, we were in compliance with all of the covenants under the Credit Facility. For further information regarding our Credit Facility see Footnote 5Long-term Debt and Lease Obligations” of Footnotes to Consolidated Financial Statements.
Senior Secured Notes
As of December 31, 2018, ION Geophysical Corporation’s 9.125% Senior Secured Second Priority Notes due December 2021 (the “Second Lien Notes”) had an outstanding principal amount of $120.6 million. Prior to its early redemption, ION Geophysical Corporation’s 8.125% Senior Secured Second-Priority Notes due May 2018 (the “Third Lien Notes”) had an aggregate principal amount of $28.5 million. In March 2018, ION Geophysical Corporation obtained consent from a majority of the Second Lien Notes holders and from PNC to redeem, in full, the Third Lien Notes prior to their stated maturity. On March 26, 2018, ION Geophysical Corporation redeemed the Third Lien Notes by paying the then outstanding principal amount, plus all accrued and unpaid interest through the redemption date.
The Second Lien Notes remain outstanding and are senior secured second-priority obligations guaranteed by the Material U.S. Subsidiaries and the Mexican Subsidiary. Interest on the Second Lien Notes accrues at the rate of 9.125% per annum and is payable semiannually in arrears on June 15 and December 15 of each year during their term, except that the interest payment otherwise payable on June 15, 2021 will be payable on December 15, 2021.
The April 2016 indenture governing the Second Lien Notes contains certain covenants that, among other things, limits or prohibits our ability and the ability of our restricted subsidiaries to take certain actions or permit certain conditions to exist during the term of the Second Lien Notes, including among other things, incurring additional indebtedness in excess of permitted indebtedness, creating liens, paying dividends and making other distributions in respect of our capital stock, redeeming our capital stock, making investments or certain other restricted payments, selling certain kinds of assets, entering into transactions with affiliates, and effecting mergers or consolidations. These and other restrictive covenants contained in the Second Lien Notes Indenture are subject to certain exceptions and qualifications. All of our subsidiaries are currently restricted subsidiaries.
As of December 31, 2018, we are in compliance with the covenants with respect to the Second Lien Notes.
On or after December 15, 2019, we may on one or more occasions redeem all or a part of the Second Lien Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Second Lien Notes redeemed during the twelve-month period beginning on December 15th of the years indicated below:
Date Percentage
2019 105.500%
2020 103.500%
2021 and thereafter 100.000%

Meeting our Liquidity Requirements
As of December 31, 2018, our total outstanding indebtedness (including capital lease obligations) was approximately $121.7 million, consisting primarily of approximately $120.6 million outstanding Second Lien Notes (maturing in December 2021) and $2.9 million of capital leases, partially offset by $2.9 million of debt issuance costs. As of December 31, 2018, there was no outstanding indebtedness under our Credit Facility.
For 2018, total capital expenditures, including investments in our multi-client data library, were $29.8 million. We currently expect that our capital expenditures, including investments in our multi-client data library, will be a range of $40.0 million to $60.0 million in 2019. Investments in our multi-client data library are dependent upon the timing of our New Venture projects and the availability of underwriting by our customers.
We believe that our existing cash balance, cash from operations and undrawn availability under our Credit Facility will be sufficient to meet our anticipated cash needs for at least the next 12 months. However, as described at Part I, Item 3. “Legal Proceedings,” there are possible scenarios involving an outcome in the WesternGeco lawsuit that could materially and adversely affect our liquidity.

Cash Flow from Operations
Net cash provided by operating activities was $7.1 million for 2018, compared to $27.6 million for 2017. The decrease was driven by lower revenue activity compared to 2017, payment of $3.75 million damages payment for the WesternGeco lawsuit, reductions in accounts payable and accrued expenses and increase in our combined accounts and unbilled receivable balance.
Net cash provided by operating activities was $27.6 million for 2017, compared to $1.0 million for 2016. The increase in net cash provided by operations was due to a significant increase in New Venture revenues in 2017, compared to 2016 and due to $20.8 million damages payment in 2016 for the WesternGeco lawsuit, which was partially offset by increases in unbilled receivables as of December 31, 2017.
Cash Flow Used In Investing Activities
Net cash flow used in investing activities was $29.8 million for 2018, compared to $24.8 million for 2017. The principal uses of cash in our investing activities during 2018 were $28.3 million of investments in our multi-client data library and $1.5 million of investments in property, plant and equipment.
Net cash flow used in investing activities was $24.8 million for 2017, compared to $13.6 million for 2016. The principal uses of cash in our investing activities during 2017 were $23.7 million of investments in our multi-client data library and $1.1 million of investments in property, plant and equipment.
Cash Flow Used in Financing Activities
Net cash flow provided by financing activities was $3.8 million for 2018, compared to $3.6 million of net cash flow used in financing activities for 2017. The net cash flow provided by financing activities during 2018 was primarily related to $47.0 million of net cash received from our public equity offering, partially offset by $30.8 million of payments on long-term debt including equipment capital leases and a $10.0 million repayment of our Credit Facility.
Net cash flow used in financing activities was $3.6 million for 2017, compared to $21.6 million of net cash flow used in financing activities for 2016. The net cash flow used in financing activities during 2017 was primarily related to $4.8 million of payments on long-term debt related to equipment capital leases, partially offset by $1.6 million of proceeds from employee stock purchases.
Inflation and Seasonality
Inflation in recent years has not had a material effect on our costs of goods or labor, or the prices for our products or services. Traditionally, our business has been seasonal, with strongest demand typically in the second half of our fiscal year.
Future Contractual Obligations
The following table sets forth estimates of future payments of our consolidated contractual obligations, as of December 31, 2018 (in thousands):
Contractual ObligationsTotal Less Than 1 Year 1-3 Years 3-5 Years More Than 5 Years
Long-term and short-term debt$121,728
 $1,159
 $120,569
 $
 $
Interest on long-term debt obligations34,901
 11,344
 23,236
 321
 
Equipment capital lease obligations2,938
 1,069
 1,869
 
 
Operating leases68,938
 13,248
 34,753
 13,914
 7,023
Purchase obligations2,908
 2,908
 
 
 
Total$231,413
 $29,728
 $180,427
 $14,235
 $7,023
The long-term and short-term debt at December 31, 2018 included $120.6 million of principal indebtedness outstanding under our Second Lien Notes that mature in December 2021. The $2.9 million of equipment capital lease obligations relates to Imaging Services’ financing of computer and other equipment purchases.
The operating lease commitments at December 31, 2018 relate to our leases for certain equipment, offices, processing centers, and warehouse space. Our purchase obligations primarily relate to our committed inventory purchase orders under which deliveries of inventory are scheduled to be made in 2019.
        

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS
 Years Ended December 31,
 2017 2016 2015
 (In thousands, except per share data)
Service revenues$159,410
 $130,640
 $160,480
Product revenues38,144
 42,168
 61,033
Total net revenues197,554
 172,808
 221,513
Cost of services103,124
 115,763
 180,215
Cost of products18,791
 21,013
 33,295
Gross profit75,639
 36,032
 8,003
Operating expenses:     
Research, development and engineering16,431
 17,833
 26,445
Marketing and sales20,778
 17,371
 30,493
General, administrative and other operating expenses47,129
 43,999
 51,697
Total operating expenses84,338
 79,203
 108,635
Loss from operations(8,699) (43,171) (100,632)
Interest expense, net(16,709) (18,485) (18,753)
Other income (expense)(3,945) 1,350
 98,275
Loss before income taxes(29,353) (60,306) (21,110)
Income tax expense24
 4,421
 4,044
Net loss(29,377) (64,727) (25,154)
Net (income) loss attributable to noncontrolling interests(865) (421) 32
Net loss attributable to ION$(30,242) $(65,148) $(25,122)
Net loss per share:     
Basic$(2.55) $(5.71) $(2.29)
Diluted$(2.55) $(5.71) $(2.29)
Weighted average number of common shares outstanding:     
Basic11,876
 11,400
 10,957
Diluted11,876
 11,400
 10,957
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

 Years Ended December 31,
 2017 2016 2015
 (In thousands)
Net loss$(29,377) $(64,727) $(25,154)
Other comprehensive income (loss), net of taxes, as appropriate:     
Foreign currency translation adjustments2,869
 (6,967) (1,974)
Total other comprehensive income (loss), net of taxes2,869
 (6,967) (1,974)
Comprehensive net loss(26,508) (71,694) (27,128)
Comprehensive (income) loss attributable to noncontrolling interests(865) (421) 32
Comprehensive net loss attributable to ION$(27,373) $(72,115) $(27,096)
See accompanying Footnotes to Consolidated Financial Statements.


ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
 Years Ended December 31,
 2017 2016 2015
 (In thousands)
Cash flows from operating activities:     
Net loss$(29,377) $(64,727) $(25,154)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:     
Depreciation and amortization (other than multi-client library)16,592
 21,975
 26,527
Amortization of multi-client data library47,102
 33,335
 35,784
Impairment of multi-client data library2,304
 
 399
Stock-based compensation expense2,552
 3,267
 5,486
Accrual (reduction) of loss contingency related to legal proceedings5,000
 (1,168) (101,978)
Loss on bond exchange
 2,182
 
Write-down of excess and obsolete inventory398
 429
 151
Deferred income taxes(5,420) (1,181) 7,444
Change in operating assets and liabilities:     
Accounts receivable1,692
 20,426
 69,491
Unbilled receivables(23,947) 6,543
 1,630
Inventories190
 2,312
 2,251
Accounts payable, accrued expenses and accrued royalties1,443
 (5,085) (30,264)
Deferred revenue5,131
 (2,759) (1,571)
Other assets and liabilities4,370
 (13,978) (6,720)
Net cash provided by (used in) operating activities28,030
 1,571
 (16,524)
Cash flows from investing activities:     
Investment in multi-client data library(23,710) (14,884) (45,558)
Purchase of property, plant, equipment and seismic rental equipment(1,063) (1,488) (19,241)
Proceeds from sale of cost method investments
 2,698
 
Other investing activities
 30
 1,263
Net cash used in investing activities(24,773) (13,644) (63,536)
Cash flows from financing activities:     
Borrowings under revolving line of credit
 15,000
 
Repayments under revolving line of credit
 (5,000) 
Payments on notes payable and long-term debt(4,816) (8,634) (7,452)
Cost associated with issuance of debt(53) (6,744) (145)
Repurchase of common stock
 (964) (1,989)
Payments to repurchase bonds
 (15,000) 
Proceeds from employee stock purchases and exercise of stock options1,619
 
 
Dividend payment to non-controlling interest(100) 
 
Other financing activities(243) (252) 73
Net cash used in financing activities(3,593) (21,594) (9,513)
Effect of change in foreign currency exchange rates on cash and cash equivalents(260) 1,386
 898
Net decrease in cash and cash equivalents(596) (32,281) (88,675)
Cash and cash equivalents at beginning of period52,652
 84,933
 173,608
Cash and cash equivalents at end of period$52,056
 $52,652
 $84,933
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIESCritical Accounting Policies and Estimates
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
 Common Stock Additional Paid-In Capital Accumulated Deficit Accumulated Other Comprehensive Loss Treasury Stock Noncontrolling Interests Total Equity
 (In thousands, except shares)Shares Amount 
Balance at January 1, 201510,965,606
 $110
 $889,284
 $(734,409) $(12,807) $(6,565) $99
 $135,712
Net (loss) income (a)

 
 
 (25,122) 
 
 4
 (25,118)
Translation adjustment
 
 
 
 (1,974) 
 (22) (1,996)
Stock-based compensation expense
 
 5,486
 
 
 
 
 5,486
Vesting of restricted stock units/awards29,191
 
 
 
 
 
 
 
Purchase of treasury shares(296,488) (3) 
 
 
 (1,986) 
 (1,989)
Restricted stock cancelled for employee minimum income taxes(6,208) 
 (126) 
 
 
 
 (126)
Issuance of stock for the ESPP10,588
 
 215
 
 
 
 
 215
Purchase of subsidiary shares from noncontrolling interest
 
 (144) 
 
 
 
 (144)
Balance at December 31, 2015 (b)
10,702,689
 107
 894,715
 (759,531) (14,781) (8,551) 81
 112,040
Net (loss) income (a)

 
 
 (65,148) 
 
 421
 (64,727)
Translation adjustment
 
 
 
 (6,967) 
 7
 (6,960)
Stock-based compensation expense
 
 3,267
 
 
 
 
 3,267
Vesting of restricted stock units/awards40,495
 
 
 
 
 
 
 
Purchase of treasury shares(155,304) (1) 
 
 
 (963) 
 (964)
Restricted stock cancelled for employee minimum income taxes(4,973) 
 (22) 
 
 
 
 (22)
Issuance of stock for the ESPP4,100
 
 23
 
 
 
 
 23
Issuance of stock in bond exchange1,205,440
 12
 1,215
 
 
 9,514
 
 10,741
Balance at December 31, 201611,792,447
 118
 899,198
 (824,679) (21,748) 
 509
 53,398
Net (loss) income
 
 
 (30,242) 
 
 865
 (29,377)
Translation adjustment
 
 
 
 2,869
 
 (35) 2,834
Dividend payment to non-controlling interest
 
 
 
 
 
 (100) (100)
Stock-based compensation expense
 
 2,552
 
 
 
 
 2,552
Exercise of stock options15,000
 
 46
 
 
 
 
 46
Vesting of restricted stock units/awards115,576
 1
 (1) 
 
 
 
 
Employee purchases of unregistered shares of common stock120,567
 1
 1,572
 
 
 
 
 1,573
Restricted stock cancelled for employee minimum income taxes(23,889) 
 (120) 
 
 
 
 (120)
Balance at December 31, 201712,019,701
 $120
 $903,247
 $(854,921) $(18,879) $
 $1,239
 $30,806
(a)Net income attributable to noncontrolling interests for 2015 excludes less than $(0.1) million related to the redeemable noncontrolling interests, which is reported in the mezzanine equity section of the Consolidated Balance Sheet.
(b)The figures for 2015, set forth in the tables above have been retroactively adjusted to reflect the one-for-fifteen reverse stock split completed on February 4, 2016.
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
FOOTNOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(1)    Summary of Significant Accounting Policies
General Description and Principles of Consolidation
ION Geophysical Corporation and its subsidiaries offer a full suite of services and products for seismic data acquisition and processing. The consolidated financial statements include the accounts of ION Geophysical Corporation and its majority-owned subsidiaries (collectively referred to as the “Company” or “ION”). Intercompany balances and transactions have been eliminated. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current presentation format.
Use of Estimates
The preparation of consolidated financial statements in conformity with generally accepted accounting principles generally accepted in the United States of America requires management to make choices between acceptable methods of accounting and to use judgment in making estimates and assumptions that affect the reported amounts of assets and liabilities, at the datedisclosure of the financial statementscontingent assets and liabilities, and the reported amounts of revenuesrevenue and expenses during the reporting period. Significantexpenses. The following accounting policies are based on, among other things, judgments and assumptions made by management that include inherent risk and uncertainties. Management’s estimates are made at discrete points in time based on the relevant market information. These estimates may be subjective in nature and involve uncertainties and mattersinformation available at the end of judgment and, therefore, cannot be determined with precision. Areas involving significant estimates include, but are not limited to, accounts and unbilled receivables, inventory valuation, sales forecasts related to multi-client data libraries, goodwill and intangible asset valuation and deferred taxes. Actual results could materially differ from those estimates.
Cash and Cash Equivalents
The Company considerseach period. We believe that all highly liquid investments with an original maturity of three months or less to be cash equivalents. The Company places its temporary cash investments with high credit quality financial institutions. At times such investments may be in excess of the Federal Deposit Insurance Corporation (FDIC) insurance limit. At December 31, 2017judgments and 2016, there was $0.4 million and $0.8 million, respectively, of long-term and short-term restricted cashestimates used to secure standby and commercial letters of credit, which is included within Long-term and Other Current Assets.
Accounts and Unbilled Receivables
Accounts and unbilled receivables are recorded at cost, less the related allowance for doubtful accounts. The Company considers current information and events regarding the customers’ ability to repay their obligations, such as the length of time the receivable balance is outstanding, the customers’ credit worthiness and historical experience. Unbilled receivables relate to revenues recognized on multi-client surveys, imaging services and ocean bottom acquisition services on a proportionate basis, and on licensing of multi-client data libraries for which invoices have not yet been presented to the customer.
Inventories
Inventories are statedprepare our financial statements were reasonable at the lower of cost (primarily first-in, first-out method) or market. The Company provides reserves for estimated obsolescence or excess inventory equaltime we made them, but circumstances may change requiring us to the difference between cost of inventory and its estimated market value based upon assumptions about future demand for the Company’s products, market conditions and the risk of obsolescence driven by new product introductions.
Property, Plant, Equipment and Seismic Rental Equipment
Property, plant, equipment and seismic rental equipment are stated at cost. Depreciation expense is provided straight-line over the following estimated useful lives:
Years
Machinery and equipment3-7
Buildings5-25
Seismic rental equipment3-5
Leased equipment and other3-10
Expenditures for renewals and betterments are capitalized; repairs and maintenance are charged to expense as incurred. The cost and accumulated depreciation of assets sold or otherwise disposed of are removed from the accounts and any gain or loss is reflectedrevise our estimates in operating expenses.

The Company evaluates the recoverability of long-lived assets, including property, plant, equipment and seismic rental equipment, when indicators of impairment exist, relying on a number of factors including operating results, business plans, economic projections and anticipated future cash flows. Impairment in the carrying value of an asset held for use is recognized whenever anticipated future cash flows (undiscounted) from an asset are estimated to be less than its carrying value. The amount of the impairment recognized is the difference between the carrying value of the asset and its fair value.
Multi-Client Data Library
The multi-client data library consists of seismic surveysways that are offered for licensing to customers on a non-exclusive basis. The capitalized costs include costs paid to third parties for the acquisition of data and related activities associated with the data creation activity and direct internal processing costs, such as salaries, benefits, computer-related expenses and other costs incurred for seismic data project design and management. For 2017, 2016 and 2015, the Company capitalized, as part of its multi-client data library, $12.7 million, $6.6 million and $6.1 million, respectively, of direct internal processing costs. At December 31, 2017 and 2016, multi-client data library costs and accumulated amortization consisted of the following (in thousands):
 December 31,
 2017 2016
Gross costs of multi-client data creation$939,077
 $906,306
Less accumulated amortization(727,872) (680,770)
Less impairments to multi-client data library(121,905) (119,601)
Total$89,300
 $105,935
The Company’s method of amortizing the costs of an in-process multi-client data library (the period during which the seismic data is being acquired and/or processed, referred to as the “New Venture” phase) consists of determining the percentage of actual revenue recognized to the total estimated revenues (which includes both revenues estimated to be realized during the New Venture phase and estimated revenues from the licensing of the resulting “on-the-shelf” data survey) and multiplying that percentage by the total cost of the project (the sales forecast method). The Company considers a multi-client data survey to be complete when all work on the creation of the seismic data is finished and that data survey is available for licensing. Once a multi-client data survey is complete, the data survey is considered “on-the-shelf” and the Company’s method of amortization is then the greater of (i) the sales forecast method or (ii) the straight-line basis over a four-year period. The greater amount of amortization resulting from the sales forecast method or the straight-line amortization policy is applied on a cumulative basis at the individual survey level. Under this policy, the Company first records amortization using the sales forecast method. The cumulative amortization recorded for each survey is then compared with the cumulative straight-line amortization. The four-year period utilized in this cumulative comparison commences when the data survey is determined to be complete. If the cumulative straight-line amortization is higher for any specific survey, additional amortization expense is recorded, resulting in accumulated amortization being equal to the cumulative straight-line amortization for such survey. The Company has determined the amortization period of four years based upon its historical experience that indicates that the majority of its revenues from multi-client surveys are derived during the acquisition and processing phases and during four years subsequent to survey completion.
The Company estimates the ultimate revenue expected to be derived from a particular seismic data survey over its estimated useful economic life to determine the costs to amortize, if greater than straight-line amortization. That estimate is made by the Company at the project’s initiation. For a completed multi-client survey, the Company reviews the estimate quarterly. If during any such review, the Company determines that the ultimate revenue for a survey is expected tocould be materially adverse to our results of operations and financial condition. We describe our significant accounting policies more or less than the original estimate of ultimate revenue for such survey, the Company decreases or increases (as the case may be) the amortization rate attributable to the future revenue from such survey. In addition,fully in connection with such reviews, the Company evaluates the recoverability of the multi-client data library, and, if required under Accounting Standards Codification (“ASC”) 360-10 “Impairment and Disposal of Long-Lived Assets,”Footnote 1 records an impairment charge with respect to such data.
Equity Method Investment
In accordance with ASC 810 Consolidation,Summary of Significant Accounting Policiesthe Company determined that INOVA Geophysical is a variable interest entity because the Company’s voting rights with respect to INOVA Geophysical are not proportionate to its ownership interest and substantially all of INOVA Geophysical’s activities are conducted on behalf of the Company and BGP, a related party to the Company. The Company is not the primary beneficiary of INOVA Geophysical because it does not have the power to direct the activities of INOVA Geophysical that most significantly impact its economic performance. Accordingly, the Company does not consolidate INOVA Geophysical, but instead accounts for INOVA Geophysical using the equity method of accounting. Under this method, an investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses since acquisition, less distributions received.

At December 31, 2014, the Company fully impaired its investment in INOVA reducing its equity investment in INOVA and its share of INOVA’s accumulated other comprehensive loss, both to zero. As of December 31, 2017, the carrying value of this investment remains zero. The Company no longer records its equity in losses or earnings and has no obligation, implicit or explicit, to fund any expenses of INOVA Geophysical.
Noncontrolling Interests
The Company has non-redeemable noncontrolling interests. Non-redeemable noncontrolling interests in majority-owned affiliates are reported as a separate component of equity in “Noncontrolling interests” in the Consolidated Balance Sheets. Net loss in the Consolidated Statements of Operations is attributable to noncontrolling interests. The activity for this noncontrolling interest relates to proprietary processing projects in Brazil.
Goodwill and Other Intangible Assets
Goodwill is allocated to reporting units, which are either the operating segment or one reporting level below the operating segment. For purposes of performing the impairment test for goodwill as required by ASC 350 “IntangiblesGoodwill and Other,” (“ASC 350”) the Company established the following reporting units: E&P Technology & Services, Optimization Software & Services, Devices and Ocean Bottom Seismic Services.
In accordance with ASC 350, the Company is required to evaluate the carrying value of its goodwill at least annually for impairment, or more frequently if facts and circumstances indicate that it is more likely than not impairment has occurred. The Company formally evaluates the carrying value of its goodwill for impairment as of December 31 for each of its reporting units. The Company first performs a qualitative assessment by evaluating relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit exceeds its carrying amount. If the Company is unable to conclude qualitatively that it is more likely than not that a reporting unit’s fair value exceeds its carrying value, then it will use a two-step quantitative assessment of the fair value of a reporting unit. To determine the fair value of these reporting units, the Company uses a discounted future returns valuation model, which includes a variety of level 3 inputs. The key inputs for the model include the operational three-year forecast for the Company and the then-current market discount factor. Additionally, the Company compares the sum of the estimated fair values of the individual reporting units less consolidated debt to the Company’s overall market capitalization as reflected by the Company’s stock price. If the carrying value of a reporting unit that includes goodwill is determined to be more than the fair value of the reporting unit, there exists the possibility of impairment of goodwill. An impairment loss of goodwill is measured in two steps by first allocating the fair value of the reporting unit to net assets and liabilities including recorded and unrecorded intangible assets to determine the implied carrying value of goodwill. The next step is to measure the difference between the carrying value of goodwill and the implied carrying value of goodwill, and, if the implied carrying value of goodwill is less than the carrying value of goodwill, an impairment loss is recorded equal to the difference. See further discussion below at Footnote 9 “Goodwill.”
The intangible assets, other than goodwill, relate to customer relationships. The Company amortizes its customer relationship intangible assets on an accelerated basis over a 10-Footnotes to 15-year period, using the undiscounted cash flows of the initial valuation models. The Company uses an accelerated basis as these intangible assets were initially valued using an income approach, with an attrition rate that resulted in a pattern of declining cash flows over a 10- to 15-year period.
Following the guidance of ASC 360 “Impairment and Disposal of Long-Lived Assets,” the Company reviews the carrying values of these intangible assets for impairment if events or changes in the facts and circumstances indicate that their carrying value may not be recoverable. Any impairment determined is recorded in the current period and is measured by comparing the fair value of the related asset to its carrying value. See further discussion below at Footnote 8 “Details of Selected Balance Sheet Accounts — Intangible AssetsConsolidated Financial Statements.
Fair Value of Financial Instruments
The Company’s financial instruments include cash and cash equivalents, short-term investments, accounts and unbilled receivables, accounts payable, accrued multi-client data library royalties and long-term debt. The carrying amounts of cash and cash equivalents, short-term investments, accounts and unbilled receivables, accounts payable and accrued multi-client data library royalties approximate fair value due to the highly liquid nature of these instruments. The fair value of the long-term debt is calculated using a market approach based upon Level 1 inputs, including an active market price.

Revenue RecognitionSenior Secured Notes
As of December 31, 2018, ION Geophysical Corporation’s 9.125% Senior Secured Second Priority Notes due December 2021 (the “Second Lien Notes”) had an outstanding principal amount of $120.6 million. Prior to its early redemption, ION Geophysical Corporation’s 8.125% Senior Secured Second-Priority Notes due May 2018 (the “Third Lien Notes”) had an aggregate principal amount of $28.5 million. In March 2018, ION Geophysical Corporation obtained consent from a majority of the Second Lien Notes holders and from PNC to redeem, in full, the Third Lien Notes prior to their stated maturity. On March 26, 2018, ION Geophysical Corporation redeemed the Third Lien Notes by paying the then outstanding principal amount, plus all accrued and unpaid interest through the redemption date.
The Company derives revenue fromSecond Lien Notes remain outstanding and are senior secured second-priority obligations guaranteed by the sale of (i) multi-client and proprietary surveys, licenses of “on-the-shelf” data libraries and imaging services within its E&P Technology & Services segment; (ii) seismic data acquisition systems and other seismic equipment; (iii) seismic command and control software systems and software solutions for operations management within its E&P Operations Optimization segment; and (iv) fully-integrated Ocean Bottom Seismic Services (“OBS”) solutions that include survey design and planning and data acquisition within its Ocean Bottom Seismic Services segment. All revenues of the E&P Technology & Services and Ocean Bottom Seismic Services segmentsMaterial U.S. Subsidiaries and the services component of revenues forMexican Subsidiary. Interest on the Optimization Software & Services group within the E&P Operations Optimization segment are classified as services revenues. All other revenues are classified as product revenues.
Multi-Client and Proprietary Surveys, and Imaging Services — As multi-client surveys are being designed, acquired and/or processed, the New Venture phase, the Company enters into non-exclusive licensing arrangements with its customers. License revenues from these New Venture survey projects are recognized during the New Venture phase as the seismic data is acquired and/or processed on a proportionate basis as work is performed. Under this method, the Company recognizes revenues based upon quantifiable measures of progress, such as kilometers acquired or days processed. Upon completion of a multi-client seismic survey, the seismic survey is considered “on-the-shelf,” and licenses to the survey data are granted to customers on a non-exclusive basis. Revenues on licenses of completed multi-client data surveys are recognized when (a) a signed final master geophysical data license agreement and accompanying supplemental license agreement are returned by the customer; (b) the purchase price for the license is fixed or determinable; (c) delivery or performance has occurred; (d) and no significant uncertainty exists as to the customer’s obligation, willingness or ability to pay. In limited situations, the Company has provided the customer with a right to exchange seismic data for another specific seismic data set. In these limited situations, the Company recognizes revenueSecond Lien Notes accrues at the earlierrate of 9.125% per annum and is payable semiannually in arrears on June 15 and December 15 of each year during their term, except that the customer exercising its exchange right or the expiration of the customer’s exchange right.interest payment otherwise payable on June 15, 2021 will be payable on December 15, 2021.
The Company also performs seismic surveys under contractsApril 2016 indenture governing the Second Lien Notes contains certain covenants that, among other things, limits or prohibits our ability and the ability of our restricted subsidiaries to specific customers, wherebytake certain actions or permit certain conditions to exist during the seismic data is owned by those customers. Revenue is recognized as the seismic data is acquired and/or processed on a proportionate basis as work is performed. The Company uses quantifiable measures of progress consistent with its multi-client surveys.
Revenues from all imaging and other services are recognized when (a) persuasive evidence of an arrangement exists, (b) the price is fixed or determinable, and (c) collectability is reasonably assured. Revenues from contract services performed on a dayrate basis are recognized as the service is performed.
Acquisition Systems and Other Seismic Equipment — For the sales of acquisition systems and other seismic equipment, the Company follows the requirements of ASC 605-10 “Revenue Recognition” and recognizes revenue when (a) evidence of an arrangement exists; (b) the price to the customer is fixed and determinable; (c) collectability is reasonably assured; and (d) the acquisition system or other seismic equipment is delivered to the customer and risk of ownership has passed to the customer, or, in the case in which a substantive customer-specified acceptance clause exists in the contract, the later of delivery or when the customer-specified acceptance is obtained.
Software — For the sales of navigation, survey and quality control software systems, the Company follows the requirements of ASC 985-605 “Software Revenue Recognition” (“ASC 985-605”). The Company recognizes revenue from sales of these software systems when (a) evidence of an arrangement exists; (b) the price to the customer is fixed and determinable; (c) collectability is reasonably assured; and (d) the software is delivered to the customer and risk of ownership has passed to the customer, or, in the limited case in which a substantive customer-specified acceptance clause exists, the later of delivery or when the customer-specified acceptance is obtained. These arrangements generally include the Company providing related services, such as training courses, engineering services and annual software maintenance. The Company allocates revenue to each element of the arrangement based upon vendor-specific objective evidence (“VSOE”) of fair value of the element or, if VSOE is not available for the delivered element, the residual method is used.
In addition to perpetual software licenses, the Company offers time-based software licenses. For time-based licenses, the Company recognizes revenue ratably over the contract term, which is generally two to five years.
Ocean Bottom Seismic Services — The Company recognizes revenues as they are realized and earned and can be reasonably measured, based on contractual day rates or on a fixed-price basis, and when collectability is reasonably assured. In connection with acquisition contracts, the Company may receive revenues for preparation and mobilization of equipment and personnel or for capital improvements to vessels. The Company defers the revenues earned and incremental costs incurred that are directly related to contract preparation and mobilization and recognizes such revenues and costs over the primary contract term of the acquisition project. The Company usesSecond Lien Notes, including among other things, incurring additional indebtedness in excess of permitted indebtedness, creating liens, paying dividends and making other distributions in respect of our capital stock, redeeming our capital stock, making investments or certain other restricted payments, selling certain kinds of assets, entering into transactions with affiliates, and effecting mergers or consolidations. These and other restrictive covenants contained in the ratioSecond Lien Notes Indenture are subject to certain exceptions and qualifications. All of square kilometers acquired asour subsidiaries are currently restricted subsidiaries.
As of December 31, 2018, we are in compliance with the covenants with respect to the Second Lien Notes.
On or after December 15, 2019, we may on one or more occasions redeem all or a percentagepart of the total square kilometers expected to be acquired overSecond Lien Notes at the primary termredemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Second Lien Notes redeemed during the twelve-month period beginning on December 15th of the contractyears indicated below:
Date Percentage
2019 105.500%
2020 103.500%
2021 and thereafter 100.000%

Meeting our Liquidity Requirements
As of December 31, 2018, our total outstanding indebtedness (including capital lease obligations) was approximately $121.7 million, consisting primarily of approximately $120.6 million outstanding Second Lien Notes (maturing in December 2021) and $2.9 million of capital leases, partially offset by $2.9 million of debt issuance costs. As of December 31, 2018, there was no outstanding indebtedness under our Credit Facility.
For 2018, total capital expenditures, including investments in our multi-client data library, were $29.8 million. We currently expect that our capital expenditures, including investments in our multi-client data library, will be a range of $40.0 million to recognize deferred revenues$60.0 million in 2019. Investments in our multi-client data library are dependent upon the timing of our New Venture projects and amortize,the availability of underwriting by our customers.
We believe that our existing cash balance, cash from operations and undrawn availability under our Credit Facility will be sufficient to meet our anticipated cash needs for at least the next 12 months. However, as described at Part I, Item 3. “Legal Proceedings,” there are possible scenarios involving an outcome in cost of services, the costs related to contract preparationWesternGeco lawsuit that could materially and mobilization. The Company recognizes the costs of relocating vessels without contracts to more promising market sectors as such costs are incurred. Upon completion of acquisition contracts, the Company recognizes in earnings any demobilization fees received and expenses incurred.adversely affect our liquidity.
        

Cash Flow from Operations
Multiple-element ArrangementsNet cash provided by operating activities was $7.1 million — When separate elements (such as an acquisition system, other seismic equipment and/or imaging and acquisition services) are contained in a single sales arrangement, or in related arrangements with the same customer, the Company follows the requirements of ASC 605-25 “for Accounting for Multiple-Element Revenue Arrangement”2018 (“ASC 605-25”).
This guidance requires that arrangement consideration be allocated at the inception of an arrangement to all deliverables using the relative selling price method. The Company allocates arrangement consideration to each deliverable qualifying as a separate unit of accounting in an arrangement based on its relative selling price. The Company determines its selling price using VSOE, if it exists, or otherwise third-party evidence (“TPE”). If neither VSOE nor TPE of selling price exists for a unit of accounting, the Company uses estimated selling price (“ESP”). The Company generally expects that it will not be able to establish TPE due to the nature of the markets in which the Company competes, and, as such, the Company typically will determine its selling price using VSOE or, if not available, ESP. VSOE is generally limited to the price charged when the same or similar product is sold on a standalone basis. If a product is seldom sold on a standalone basis, it is unlikely that the Company can determine VSOE for the product.
The objective of ESP is to determine the price at which the Company would transact if the product were sold by the Company on a standalone basis. The Company’s determination of ESP involves a weighting of several factors based on the specific facts and circumstances of the arrangement. Specifically, the Company considers the anticipated margin on the particular deliverable, the selling price and profit margin for similar products and the Company’s ongoing pricing strategy and policies.
Product Warranty — The Company generally warrants that its manufactured equipment will be free from defects in workmanship, materials and parts. Warranty periods generally range from 30 days, compared to three years from the date of original purchase, depending on the product. The Company provides for estimated warranty as a charge to costs of sales at the time of sale. However, new information may become available, or circumstances (such as applicable laws and regulations) may change, thereby resulting in an increase or decrease in the amount required to be accrued for such matters (and therefore a decrease or increase in reported net income in the period of such change). In limited cases, the Company has provided indemnification of customers for potential intellectual property infringement claims relating to products sold.
Research, Development and Engineering
Research, development and engineering costs primarily relate to activities that are designed to improve the quality of the subsurface image and overall acquisition economics of the Company’s customers. The costs associated with these activities are expensed as incurred. These costs include prototype material and field testing expenses, along with the related salaries and stock-based compensation, facility costs, consulting fees, tools and equipment usage and other miscellaneous expenses associated with these activities.
Stock-Based Compensation
The Company accounts for stock-based compensation under the provisions of ASC 718, “Compensation – Stock Compensation” (“ASC 718”). The Company estimates the value of stock option awards on the date of grant using the Black-Scholes option pricing model. The determination of the fair value of stock-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, risk-free interest rate and expected dividends. The Company recognizes stock-based compensation on the straight-line basis over the service period of each award (generally the award’s vesting period).
Income Taxes
Income taxes are accounted for under the liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, including operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply in the years in which those temporary differences are expected to be recovered or settled. The Company records a valuation allowance when it is more likely than not that all or a portion of deferred tax assets will not be realized (see Footnote 5 “Income Taxes”). The effect on deferred income tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
Debt Issuance Costs
In the first quarter of 2016, the Company adopted Accounting Standards Update (ASU) 2015-03, which requires entities to present debt issuance costs related to a debt liability as a direct deduction from the carrying amount of that debt liability on the balance sheet as opposed to being presented as a deferred charge, and ASU 2015-15, which adds paragraphs to ASU 2015-03 indicating that the SEC staff would not object to an entity deferring and presenting debt issuance costs related to

line of credit arrangements as an asset and subsequently amortizing the deferred debt issuance costs ratably over the term of the line of credit arrangement, regardless of whether there are any outstanding borrowings on the line of credit arrangement. 
For the years ended December 31, 2017 and 2016, unamortized debt issuance costs related to the Company’s long-term debt are reported on the Consolidated Balance Sheets as a reduction of the carrying value of the related debt, except for the unamortized debt issuance costs related to the Company’s Credit Facility which are reported in “Other Assets” on the Consolidated Balance Sheets ($0.2 million for 2017 and $1.2 million for 2016). Prior to adoption, the Company reported all unamortized debt issuance costs in “Other Assets” on the Consolidated Balance Sheets.
Comprehensive Net Loss
Comprehensive net loss as shown in the Consolidated Statements of Comprehensive Loss and the balance in Accumulated Other Comprehensive Loss as shown in the Consolidated Balance Sheets as of December 31, 2017 and 2016, consist of foreign currency translation adjustments.
Foreign Currency Gains and Losses
Assets and liabilities of the Company’s subsidiaries operating outside the United States that have a functional currency other than the U.S. dollar have been translated to U.S. dollars using the exchange rate in effect at the balance sheet date. Results of foreign operations have been translated using the average exchange rate during the periods of operation. Resulting translation adjustments have been recorded as a component of Accumulated Other Comprehensive Loss. Foreign currency transaction gains and losses are included in the Consolidated Statements of Operations in Other income as they occur. Total foreign currency transaction losses were $1.6 million, $3.3 million and $2.127.6 million for 2017. The decrease was driven by lower revenue activity compared to 2017, payment of $3.75 million damages payment for the WesternGeco lawsuit, reductions in accounts payable and accrued expenses and increase in our combined accounts and unbilled receivable balance.
Net cash provided by operating activities was $27.6 million for 2017, compared to $1.0 million for 2016. The increase in net cash provided by operations was due to a significant increase in New Venture revenues in 2017, compared to 2016 and due to $20.8 million damages payment in 2016 for the WesternGeco lawsuit, which was partially offset by increases in unbilled receivables as of December 31, 2017.
Cash Flow Used In Investing Activities
Net cash flow used in investing activities was $29.8 million for 2018, compared to 2016$24.8 million for 2017. The principal uses of cash in our investing activities during 2018 were $28.3 million of investments in our multi-client data library and 2015$1.5 million of investments in property, plant and equipment.
Net cash flow used in investing activities was $24.8 million for 2017, compared to $13.6 million for 2016. The principal uses of cash in our investing activities during 2017 were $23.7 million of investments in our multi-client data library and $1.1 million of investments in property, plant and equipment.
Cash Flow Used in Financing Activities
Net cash flow provided by financing activities was $3.8 million for 2018, respectively.compared to $3.6 million of net cash flow used in financing activities for 2017. The net cash flow provided by financing activities during 2018 was primarily related to $47.0 million of net cash received from our public equity offering, partially offset by $30.8 million of payments on long-term debt including equipment capital leases and a $10.0 million repayment of our Credit Facility.
ConcentrationNet cash flow used in financing activities was $3.6 million for 2017, compared to $21.6 million of Foreign Sales Risk
net cash flow used in financing activities for 2016. The majoritynet cash flow used in financing activities during 2017 was primarily related to $4.8 million of the Company’s foreign sales are denominated in U.S. dollars. For 2017, 2016 and 2015, international sales comprised 76%, 78% and 66%, respectively,payments on long-term debt related to equipment capital leases, partially offset by $1.6 million of total net revenues. The significant decline in oil prices that began in the fourth quarter of 2014 have continued to impact the global market throughout 2015 and 2016.  Since 2008, global economic problems and uncertainties have generally increased in scope and nature. To the extent that world events or economic conditions negatively affect the Company’s future sales to customers in many regions of the world, as well as the collectability of the Company’s existing receivables, the Company’s future results of operations, liquidity and financial condition would be adversely affected.proceeds from employee stock purchases.
(2)    SegmentInflation and Geographic InformationSeasonality
Inflation in recent years has not had a material effect on our costs of goods or labor, or the prices for our products or services. Traditionally, our business has been seasonal, with strongest demand typically in the second half of our fiscal year.
Future Contractual Obligations
The Company evaluates and reviews its results based on three business segments: E&P Technology & Services, E&P Operations Optimization, and Ocean Bottom Seismic Services. The Company measures segment operating results based on income (loss) from operations.

A summaryfollowing table sets forth estimates of segment information followsfuture payments of our consolidated contractual obligations, as of December 31, 2018 (in thousands):
 Years Ended December 31,
 2017 2016 2015
Net revenues:     
E&P Technology & Services:     
New Venture$100,824
 $27,362
 $48,294
Data Library40,016
 39,989
 63,326
Total multi-client revenues140,840
 67,351
 111,620
Imaging Services16,409
 25,538
 45,630
Total$157,249
 $92,889
 $157,250
E&P Operations Optimization:     
Devices$23,610
 $26,746
 $36,269
Optimization Software & Services16,695
 16,756
 27,994
Total$40,305
 $43,502
 $64,263
Ocean Bottom Seismic Services$
 $36,417
 $
Total$197,554
 $172,808
 $221,513
Gross profit (loss):     
E&P Technology & Services$65,196
 $4,708
 $13,508
E&P Operations Optimization20,076
 21,745
 33,995
Ocean Bottom Seismic Services(9,633) 9,579
 (39,500)
Total$75,639
 $36,032
 $8,003
Gross margin:     
E&P Technology & Services41% 5% 9%
E&P Operations Optimization50% 50% 53%
Ocean Bottom Seismic Services% 26% %
Total38% 21% 4%
Loss from operations:     
E&P Technology & Services$42,505
 $(16,446) $(24,941)
E&P Operations Optimization8,022
 9,652
 20,131
Ocean Bottom Seismic Services(16,259) (1,756) (55,080)
Support and other(42,967) (34,621) (40,742)
Loss from operations(8,699) (43,171) (100,632)
Interest expense, net(16,709) (18,485) (18,753)
Other income (expense)(3,945) 1,350
 98,275
Loss before income taxes$(29,353) $(60,306) $(21,110)
Contractual ObligationsTotal Less Than 1 Year 1-3 Years 3-5 Years More Than 5 Years
Long-term and short-term debt$121,728
 $1,159
 $120,569
 $
 $
Interest on long-term debt obligations34,901
 11,344
 23,236
 321
 
Equipment capital lease obligations2,938
 1,069
 1,869
 
 
Operating leases68,938
 13,248
 34,753
 13,914
 7,023
Purchase obligations2,908
 2,908
 
 
 
Total$231,413
 $29,728
 $180,427
 $14,235
 $7,023
The long-term and short-term debt at December 31, 2018 included $120.6 million of principal indebtedness outstanding under our Second Lien Notes that mature in December 2021. The $2.9 million of equipment capital lease obligations relates to Imaging Services’ financing of computer and other equipment purchases.
 Years Ended December 31,
 2017 2016 2015
Depreciation and amortization (including multi-client data library):     
E&P Technology & Services$53,663
 $44,100
 $51,014
E&P Operations Optimization1,349
 1,780
 2,869
Ocean Bottom Seismic Services7,001
 7,511
 6,158
Support and other1,681
 1,919
 2,270
Total$63,694
 $55,310
 $62,311
The operating lease commitments at December 31, 2018 relate to our leases for certain equipment, offices, processing centers, and warehouse space. Our purchase obligations primarily relate to our committed inventory purchase orders under which deliveries of inventory are scheduled to be made in 2019.
        

 December 31,
 2017 2016
Total assets:   
E&P Technology & Services$156,555
 $159,965
E&P Operations Optimization74,361
 76,992
Ocean Bottom Seismic Services20,828
 29,908
Support and other49,325
 46,351
Total$301,069
 $313,216
Critical Accounting Policies and Estimates
A summaryThe preparation of totalconsolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make choices between acceptable methods of accounting and to use judgment in making estimates and assumptions that affect the reported amounts of assets by geographic area follows (in thousands):
 December 31,
 2017 2016
Total assets by geographic area:   
North America$116,598
 $145,013
Europe51,876
 61,329
Middle East70,308
 72,984
Latin America55,661
 23,891
Other6,626
 9,999
Total$301,069
 $313,216
A summaryand liabilities, disclosure of fixedcontingent assets less accumulated depreciation by geographic area as follows (in thousands):
 December 31,
 2017 2016
Total fixed assets less accumulated deprecation by geographic area:   
North America$10,609
 $17,637
Europe20,725
 27,714
Middle East20,543
 21,370
Latin America170
 202
Other106
 565
Total$52,153
 $67,488




Intersegment sales are insignificant for all periods presented. Support and other assets include all assets specifically related to support personnel and operation and a majority of cash and cash equivalents. Depreciation and amortization expense is allocated to segments based upon use of the underlying assets.

A summary of net revenues by geographic area follows (in thousands):
 Years Ended December 31,
 2017 2016 2015
Net revenues by geographic area:     
Latin America$68,241
 $24,090
 $16,406
North America48,120
 38,005
 74,634
Europe44,930
 41,674
 72,577
Asia Pacific18,896
 16,226
 19,135
Commonwealth of Independent States8,222
 1,929
 11,008
Africa6,837
 41,417
 13,182
Middle East2,308
 9,467
 14,571
Total$197,554
 $172,808
 $221,513
Net revenues are attributed to geographic areas on the basis of the ultimate destination of the equipment or service, if known, or the geographic area imaging services are provided. If the ultimate destination of such equipment is not known, net revenues are attributed to the geographic area of initial shipment.
(3)    Long-term Debt and Lease Obligations
 December 31,
Obligations (in thousands)2017 2016
Senior secured second-priority lien notes (maturing December 15, 2021)$120,569
 $120,569
Senior secured third-priority lien notes (maturing May 15, 2018)28,497
 28,497
Revolving credit facility (maturing August 22, 2019)10,000
 10,000
Equipment capital leases279
 3,446
Other debt1,382
 1,415
Costs associated with issuances of debt (1)
(3,983) (5,137)
Total156,744
 158,790
Current portion of long-term debt and lease obligations(40,024) (14,581)
Non-current portion of long-term debt and lease obligations$116,720
 $144,209
(1)
Represents debt issuance costs presented as a direct deduction from the carrying amount of the associated debt liability.

Revolving Credit Facility
In August 2014, ION and its material U.S. subsidiaries, GX Technology Corporation, ION Exploration Products (U.S.A.), Inc. and I/O Marine Systems, Inc. (collectively, the “Subsidiary Borrowers”), and together with the Company, collectively, the “Borrowers”) entered into a Revolving Credit and Security Agreement with PNC Bank, National Association (“PNC”), as agent (the “Original Credit Agreement”), which was amended by the First Amendment to Revolving Credit and Security Agreement in August 2015 (the “First Amendment”)liabilities, and the Second Amendment (as defined below) (the Original Credit Agreement, as amended by the First Amendment,reported amounts of revenue and the Second Amendment, the “Credit Facility”).
expenses. The Credit Facility is available to provide for the Borrowers’ general corporate needs, including working capital requirements, capital expenditures, surety deposits and acquisition financing. The maximum amount of the revolving line of credit under the Credit Facility is the lesser of $40.0 million or a monthly borrowing base.
On April 28, 2016, the Borrowers and PNC entered into a second amendment (the “Second Amendment”) to the Credit Facility. The Second Amendment, among other things:
increased the applicable margin for loans by 0.50% per annum (from 2.50% per annum to 3.00% per annum for alternate base rate loans and from 3.50% per annum to 4.00% per annum for LIBOR-based loans);
increased the minimum excess availability threshold to avoid triggering the agent’s rights to exercise dominion over cash and deposit accounts and increases certain of the thresholds upon which such dominion ceases;
increased the minimum liquidity threshold to avoid triggering the Company’s obligation to calculate and comply with the existing fixed charge coverage ratio and increased certain of the thresholds upon which such required calculation and compliance cease;

established a reserve that reduced the amount available to be borrowed by the aggregate amount owing under all Third Lien Notes that remain outstanding (if any) on or after February 14, 2018 (i.e., 90 days prior to the stated maturity of the Third Lien Notes);
increased the maximum amount of certain permitted junior indebtedness to $200.0 million (from $175.0 million);
incorporated technical and conforming changes to reflect that the Second Lien Notes and the remaining Third Lien Notes (and any permitted refinancing thereof or subsequently incurred replacement indebtedness meeting certain requirements) constitute permitted indebtedness;
clarified the circumstances and mechanics under which the Company may prepay, repurchase or redeem the Second Lien Notes, the remaining Third Lien Notes and certain other junior indebtedness;
modified the cross-default provisions to incorporated defaults under the Second Lien Notes, the remaining Third Lien Notes and certain other junior indebtedness; and
eliminated the potential early commitment termination date and early maturity date that would otherwise have occurred ninety (90) days prior the maturity date of the Third Lien Notes if any of the Third Lien Notes then remained outstanding.
The borrowing base under the Credit Facility will increase or decrease monthly using a formulafollowing accounting policies are based on, certain eligible receivables, eligible inventory and other amounts, including a percentage of the net orderly liquidation value of the Borrowers’ multi-client data library (not to exceed $15.0 million for the multi-client data library data component).  As of December 31, 2017, the borrowing base under the Credit Facility was $25.5 million and there was $10.0 million of indebtedness resulting in $15.5 million of undrawn borrowing base availability under the Credit Facility. The Credit Facility is scheduled to mature on August 22, 2019.
The obligations of Borrowers under the Credit Facility are secured by a first-priority security interest in 100% of the stock of the Subsidiary Borrowers and 65% of the equity interest in ION International Holdings L.P. and by substantially all other assets of the Borrowers.
The Credit Facility contains covenants that, among other things, limit or prohibit the Borrowers, subject to certain exceptionsjudgments and qualifications, from incurring additional indebtedness (including capital lease obligations), repurchasing equity, paying dividends or distributions, granting or incurring additional liensassumptions made by management that include inherent risk and uncertainties. Management’s estimates are based on the Borrowers’ properties, pledging shares of the Borrowers’ subsidiaries, entering into certain merger transactions, entering into transactions with the Company’s affiliates, making certain sales or other dispositions of the Borrowers’ assets, making certain investments, acquiring other businesses and entering into sale-leaseback transactions with respect to the Borrowers’ property.
The Credit Facility, requires that ION and the Subsidiary Borrowers maintain a minimum fixed charge coverage ratio of 1.1 to 1.0 as ofrelevant information available at the end of each fiscal quarter during the existence of a covenant testing trigger event. The fixed charge coverage ratio is defined as the ratio of (i) ION’s EBITDA, minus unfunded capital expenditures made during the relevant period, minus distributions (including tax distributions) and dividends made during the relevant period, minus cash taxes paid during the relevant period, to (ii) certain debt payments made during the relevant period. A covenant testing trigger event occurs upon (a) the occurrence and continuance of an event of default under the Credit Facility or (b) the failure to maintain a measure of liquidity greater than (i) $7.5 million for five consecutive business days or (ii) $6.5 million on any given business day. Liquidity, as defined in the Credit Facility, is the Company’s excess availability to borrow ($15.5 million at December 31, 2017) plus the aggregate amount of unrestricted cash held by ION, the Subsidiary Borrowers and their domestic subsidiaries. At December 31, 2017, ION, the Subsidiary Borrowers and their domestic subsidiaries had unrestricted cash totaling $39.3 million and non-domestic subsidiaries had unrestricted cash totaling $12.7 million.
At December 31, 2017, the Company was in compliance withWe believe that all of the covenants underjudgments and estimates used to prepare our financial statements were reasonable at the Credit Facility.
The Credit Facility, as amended, contains customary eventtime we made them, but circumstances may change requiring us to revise our estimates in ways that could be materially adverse to our results of default provisions (including a “changeoperations and financial condition. We describe our significant accounting policies more fully in Footnote 1Summary of control” event affecting ION), the occurrenceSignificant Accounting Policies of which could leadFootnotes to an acceleration of the Company’s obligations under the Credit Facility as amended.Consolidated Financial Statements.
Senior Secured Notes
In May 2013, the Company sold $175.0 million aggregate principal amountAs of 8.125% Senior Secured Second-Priority Notes dueDecember 31, 2018, (the “Third Lien Notes”) in a private offering pursuant to an Indenture dated as of May 13, 2013 (the Third Lien Notes Indenture”). Prior to the completion of the Exchange Offer (as defined below) and Consent Solicitation (as defined below) on April 28, 2016, the Third Lien Notes were senior secured second-priority obligations of the Company. After giving effect to the Exchange Offer and Consent Solicitation, the remaining aggregate principal amount of approximately $28.5 million of outstanding Third Lien Notes became senior secured third-priority obligations of the Company subordinated to the liens securing all senior and second priority indebtedness of the Company, including under the Credit Facility and Second-Priority Lien Notes (defined below).

Pursuant to the Exchange Offer and Consent Solicitation, the Company (i) issued approximately $120.6 million in aggregate principal amount of the Company’s newION Geophysical Corporation’s 9.125% Senior Secured Second Priority Notes due December 2021 (the “Second Lien Notes”) had an outstanding principal amount of $120.6 million. Prior to its early redemption, ION Geophysical Corporation’s 8.125% Senior Secured Second-Priority Notes due May 2018 (the “Third Lien Notes”) had an aggregate principal amount of $28.5 million. In March 2018, ION Geophysical Corporation obtained consent from a majority of the Second Lien Notes holders and collectively withfrom PNC to redeem, in full, the Third Lien Notes prior to their stated maturity. On March 26, 2018, ION Geophysical Corporation redeemed the “Notes”) and 1,205,477 shares of the Company’s common stock in exchange for approximately $120.6 million in aggregate principal amount of Third Lien Notes and (ii) purchased approximately $25.9 million in aggregateby paying the then outstanding principal amount, of Third Lien Notes in exchange for aggregate cash consideration totaling approximately $15.0 million, plus all accrued and unpaid interest onthrough the Third Lien Notes from the applicable last interest payment date to, but not including, April 28, 2016.
After giving effect to the Exchange Offer and Consent Solicitation, the aggregate principal amount of the Third Lien Notes remaining outstanding was approximately $28.5 million and the aggregate principal amount of Second Lien Notes outstanding was approximately $120.6 million.
The Third Lien Notes are guaranteed by the Company’s material U.S. subsidiaries, GX Technology Corporation, ION Exploration Products (U.S.A.), Inc. and I/O Marine Systems, Inc. (the “Guarantors”), and mature on May 15, 2018. Interest on the Third Lien Notes accrues at the rate of 8.125% per annum and will be payable semiannually in arrears on May 15 and November 15 of each year during their term.
Prior to the completion of the Exchange Offer and Consent Solicitation, the Third Lien Notes Indenture contained certain covenants that, among other things, limited or prohibited the Company’s ability and the ability of its restricted subsidiaries to take certain actions or permit certain conditions to exist during the term of the Third Lien Notes, including among other things, incurring additional indebtedness, creating liens, paying dividends and making other distributions in respect of the Company’s capital stock, redeeming the Company’s capital stock, making investments or certain other restricted payments, selling certain kinds of assets, entering into transactions with affiliates, and effecting mergers or consolidations. These and other restrictive covenants contained in the Third Lien Notes Indenture are subject to certain exceptions and qualifications. After giving effect to the Exchange Offer and Consent Solicitation, the Third Lien Notes Indenture was amended to, among other things, provide for the release of the second priority security interest in the collateral securing the remaining Third Lien Notes and the grant of a third priority security interest in the collateral, subordinate to liens securing all senior and second priority indebtedness of the Company, including the Credit Facility and the Second Lien Notes, and eliminate substantially all of the restrictive covenants and certain events of default pertaining to the remaining Third Lien Notes.
As of December 31, 2017, the Company was in compliance with the covenants with respect to the Third Lien Notes.redemption date.
The Second Lien Notes remain outstanding and are senior secured second-priority obligations guaranteed by the Guarantors. The Second Lien Notes mature on December 15, 2021.Material U.S. Subsidiaries and the Mexican Subsidiary. Interest on the Second Lien Notes accrues at the rate of 9.125% per annum and is payable semiannually in arrears on June 15 and December 15 of each year during their term, beginning June 15, 2016, except that the interest payment otherwise payable on June 15, 2021 will be payable on December 15, 2021.
The indenture dated April 28, 2016 indenture governing the Second Lien Notes (the “Second Lien Notes Indenture”) contains certain covenants that, among other things, limitlimits or prohibit the Company’sprohibits our ability and the ability of itsour restricted subsidiaries to take certain actions or permit certain conditions to exist during the term of the Second Lien Notes, including among other things, incurring additional indebtedness in excess of permitted indebtedness, creating liens, paying dividends and making other distributions in respect of the Company’sour capital stock, redeeming the Company’sour capital stock, making investments or certain other restricted payments, selling certain kinds of assets, entering into transactions with affiliates, and effecting mergers or consolidations. These and other restrictive covenants contained in the Second Lien Notes Indenture are subject to certain exceptions and qualifications. All of the Company’sour subsidiaries are currently restricted subsidiaries.
As of December 31, 2018, we are in compliance with the covenants with respect to the Second Lien Notes.
On or after December 15, 2019, we may on one or more occasions redeem all or a part of the Second Lien Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Second Lien Notes redeemed during the twelve-month period beginning on December 15th of the years indicated below:
Date Percentage
2019 105.500%
2020 103.500%
2021 and thereafter 100.000%

Meeting our Liquidity Requirements
As of December 31, 2018, our total outstanding indebtedness (including capital lease obligations) was approximately $121.7 million, consisting primarily of approximately $120.6 million outstanding Second Lien Notes (maturing in December 2021) and $2.9 million of capital leases, partially offset by $2.9 million of debt issuance costs. As of December 31, 2018, there was no outstanding indebtedness under our Credit Facility.
For 2018, total capital expenditures, including investments in our multi-client data library, were $29.8 million. We currently expect that our capital expenditures, including investments in our multi-client data library, will be a range of $40.0 million to $60.0 million in 2019. Investments in our multi-client data library are dependent upon the timing of our New Venture projects and the availability of underwriting by our customers.
We believe that our existing cash balance, cash from operations and undrawn availability under our Credit Facility will be sufficient to meet our anticipated cash needs for at least the next 12 months. However, as described at Part I, Item 3. “Legal Proceedings,” there are possible scenarios involving an outcome in the WesternGeco lawsuit that could materially and adversely affect our liquidity.

Cash Flow from Operations
Net cash provided by operating activities was $7.1 million for 2018, compared to $27.6 million for 2017. The decrease was driven by lower revenue activity compared to 2017, payment of $3.75 million damages payment for the WesternGeco lawsuit, reductions in accounts payable and accrued expenses and increase in our combined accounts and unbilled receivable balance.
Net cash provided by operating activities was $27.6 million for 2017, compared to $1.0 million for 2016. The increase in net cash provided by operations was due to a significant increase in New Venture revenues in 2017, compared to 2016 and due to $20.8 million damages payment in 2016 for the WesternGeco lawsuit, which was partially offset by increases in unbilled receivables as of December 31, 2017.
Cash Flow Used In Investing Activities
Net cash flow used in investing activities was $29.8 million for 2018, compared to $24.8 million for 2017. The principal uses of cash in our investing activities during 2018 were $28.3 million of investments in our multi-client data library and $1.5 million of investments in property, plant and equipment.
Net cash flow used in investing activities was $24.8 million for 2017, compared to $13.6 million for 2016. The principal uses of cash in our investing activities during 2017 were $23.7 million of investments in our multi-client data library and $1.1 million of investments in property, plant and equipment.
Cash Flow Used in Financing Activities
Net cash flow provided by financing activities was $3.8 million for 2018, compared to $3.6 million of net cash flow used in financing activities for 2017. The net cash flow provided by financing activities during 2018 was primarily related to $47.0 million of net cash received from our public equity offering, partially offset by $30.8 million of payments on long-term debt including equipment capital leases and a $10.0 million repayment of our Credit Facility.
Net cash flow used in financing activities was $3.6 million for 2017, compared to $21.6 million of net cash flow used in financing activities for 2016. The net cash flow used in financing activities during 2017 was primarily related to $4.8 million of payments on long-term debt related to equipment capital leases, partially offset by $1.6 million of proceeds from employee stock purchases.
Inflation and Seasonality
Inflation in recent years has not had a material effect on our costs of goods or labor, or the prices for our products or services. Traditionally, our business has been seasonal, with strongest demand typically in the second half of our fiscal year.
Future Contractual Obligations
The following table sets forth estimates of future payments of our consolidated contractual obligations, as of December 31, 2018 (in thousands):
Contractual ObligationsTotal Less Than 1 Year 1-3 Years 3-5 Years More Than 5 Years
Long-term and short-term debt$121,728
 $1,159
 $120,569
 $
 $
Interest on long-term debt obligations34,901
 11,344
 23,236
 321
 
Equipment capital lease obligations2,938
 1,069
 1,869
 
 
Operating leases68,938
 13,248
 34,753
 13,914
 7,023
Purchase obligations2,908
 2,908
 
 
 
Total$231,413
 $29,728
 $180,427
 $14,235
 $7,023
The long-term and short-term debt at December 31, 2018 included $120.6 million of principal indebtedness outstanding under our Second Lien Notes that mature in December 2021. The $2.9 million of equipment capital lease obligations relates to Imaging Services’ financing of computer and other equipment purchases.
The operating lease commitments at December 31, 2018 relate to our leases for certain equipment, offices, processing centers, and warehouse space. Our purchase obligations primarily relate to our committed inventory purchase orders under which deliveries of inventory are scheduled to be made in 2019.

Critical Accounting Policies and Estimates
The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make choices between acceptable methods of accounting and to use judgment in making estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities, and the reported amounts of revenue and expenses. The following accounting policies are based on, among other things, judgments and assumptions made by management that include inherent risk and uncertainties. Management’s estimates are based on the relevant information available at the end of each period. We believe that all of the judgments and estimates used to prepare our financial statements were reasonable at the time we made them, but circumstances may change requiring us to revise our estimates in ways that could be materially adverse to our results of operations and financial condition. We describe our significant accounting policies more fully in Footnote 1Summary of Significant Accounting Policies” of Footnotes to Consolidated Financial Statements.
Revenue Recognition
On January 1, 2018, we adopted Accounting Standards Codification Topic 606 – Revenue from Contracts with Customers and all the related amendments, (“ASC 606”) using the modified retrospective method. This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaborative arrangements and financial instruments. The adoption of ASC 606 did not have a material impact on our consolidated balance sheets or consolidated statements of operations for any of our reporting segments.
We derive revenue from the sale or license of (i) multi-client and proprietary data, imaging services and E&P Advisors consulting services within our E&P Technology & Services segment; (ii) seismic data acquisition systems and other seismic equipment, (iii) seismic command and control software systems and software solutions for operations management within our Operations Optimization segment; and (iv) a full suite of technology and services within our Ocean Bottom Integrated Technologies segment. All revenues of the E&P Technology & Services and Ocean Bottom Integrated Technologies segments and the services component of revenues for the Optimization Software & Services group as part of the Operations Optimization segment are classified as services revenues. All other revenues are classified as product revenues.
We use a five-step model to determine proper revenue recognition from customer contracts. Revenue is recognized when (i) a contract is approved by all parties; (ii) the goods or services promised in the contract are identified; (iii) the consideration we expect to receive in exchange for the goods or services promised is determined; (iv) the consideration is allocated to the goods and services in the contract; and (v) control of the promised goods or services is transferred to the customer. We do not disclose the value of contractual future performance obligations such as backlog with an original expected length of one year or less.
Multi-client and Proprietary Surveys, Imaging Services and E&P Advisors Services - As multi-client seismic surveys are being designed, acquired or processed (the “New Venture” phase), we enter into non-exclusive licensing arrangements with our customers, who pre-fund or underwrite these programs in part. License revenues from these surveys are recognized during the New Venture phase as the seismic data is acquired and/or processed on a proportionate basis as work is performed and control is transferred to the customer. Under this method, we recognize revenue based upon quantifiable measures of progress, such as kilometers acquired or surveys of performance completed to date. Upon completion of a multi-client seismic survey, it is considered “on-the-shelf,” and licenses to the survey data are granted to customers on a non-exclusive basis.
We also perform seismic surveys, imaging and other services under contracts to specific customers, whereby the seismic data is owned by those customers. We recognize revenue as the seismic data is acquired and/or processed on a proportionate basis as work is performed. We use quantifiable measures of progress consistent with our multi-client seismic surveys.
Acquisition Systems and Other Seismic Equipment - For sales of seismic data acquisition systems and other seismic equipment, we recognize revenue when control of the goods has transferred to the customer. Transfer of control generally occurs when (i) we have a present right to payment; (ii) the customer has legal title to the asset; (iii) we have transferred physical possession of the asset; and (iv) the customer has significant rewards of ownership; or (v) the customer has accepted the asset.
Software - Licenses for our navigation, survey design and quality control software systems provide the customer with a right to use the software. We offer usage-based licenses under which we receive a monthly fee based on the number of vessels and licenses used. For these usage-based licenses, revenue is recognized as the performance obligations are performed over the contract term, which is generally two to five years. In addition to usage-based licenses, we offer perpetual software licenses as it exists when made available to the customer. Revenue from these licenses is recognized upfront at the point in time when the software is made available to the customer.
These arrangements generally include us providing related services, such as training courses, engineering services and annual software maintenance. We allocate consideration to each element of the arrangement based upon directly observable or estimated standalone selling prices. Revenue is recognized for these services as control transfers to the customer over time.

Ocean Bottom Integrated Technologies - We recognize revenue as the seismic data is acquired and control transfers to the customer. We use quantifiable measures of progress consistent with our multi-client surveys. In connection with acquisition contracts, we may receive revenues for preparation and mobilization of equipment and personnel, capital improvements to vessels, or demobilization activities. We defer the revenues earned and incremental costs incurred that are directly related to these activities and recognizes such revenues and costs over the primary contract term of the acquisition project as we transfer the goods and services to the customer. We recognize the costs of relocating vessels without contracts to more promising market sectors as such costs are incurred.
Multi-Client Data Library
Our multi-client data library consists of seismic surveys that are offered for licensing to customers on a non-exclusive basis. The capitalized costs include the costs paid to third parties for the acquisition of data and related activities associated with the data creation activity and direct internal processing costs, such as salaries, benefits, computer-related expenses and other costs incurred for seismic data project design and management. For 2018, 2017 and 2016, we capitalized, as part of our multi-client data library, $11.9 million, $12.7 million and $6.6 million, respectively, of direct internal processing costs.
Our method of amortizing the costs of an in-process multi-client survey (the period during which the seismic data is being acquired or processed, the New Venture phase) consists of determining the percentage of actual revenue recognized to the total estimated revenues (which includes both revenues estimated to be realized during the New Venture phase and estimated revenues from the licensing of the resulting “on-the-shelf” survey data) and multiplying that percentage by the total cost of the project (the sales forecast method). We consider a multi-client survey to be complete when all work on the creation of the seismic data is finished and that survey is available for licensing.
Once a multi-client data survey is completed, the data survey is considered “on-the-shelf” and our method of amortization is then the greater of (i) the sales forecast method or (ii) the straight-line basis over a four-year period. The greater amount of amortization resulting from the sales forecast method or the straight-line amortization policy is applied on a cumulative basis at the individual survey level. Under this policy, we first record amortization using the sales forecast method. The cumulative amortization recorded for each survey is then compared with the cumulative straight-line amortization. The four-year period utilized in this cumulative comparison commences when the data survey is determined to be complete. If the cumulative straight-line amortization is higher for any specific survey, additional amortization expense is recorded, resulting in the accumulated amortization being equal to the cumulative straight-line amortization for that survey. We have determined the amortization period to be four years based upon our historical experience that indicates that the majority of our revenues from multi-client surveys are derived during the acquisition and processing phases and during the four years subsequent to survey completion.
Estimated sales are determined based upon discussions with our customers, our experience and our knowledge of industry trends. Changes in sales estimates may have the effect of changing the percentage relationship of cost of services to revenue. In applying the sales forecast method, an increase in the projected sales of a survey will result in lower cost of services as a percentage of revenue and higher earnings when revenue associated with that particular survey is recognized, while a decrease in projected sales will have the opposite effect. Assuming that the overall volume of sales mix of surveys generating revenue in the period was held constant in 2018, an increase of 10% in the sales forecasts of all surveys would have increased our amortization expense by approximately $1.5 million.
We estimate the ultimate revenue expected to be derived from a particular seismic data survey over its estimated useful economic life to determine the costs to amortize, if greater than straight-line amortization. That estimate is made by us at the project’s initiation. For a completed multi-client survey, we review the estimate quarterly. If during any such review, we determine that the ultimate revenue for a survey is expected to be materially more or less than the original estimate of total revenue for such survey, we decrease or increase (as the case may be) the amortization rate attributable to the future revenue from such survey. In addition, in connection with such reviews, we evaluate the recoverability of the multi-client data library, and, if required, record an impairment charge with respect to such data.
Reserve for Excess and Obsolete Inventories
Our reserve for excess and obsolete inventories is based on historical sales trends and various other assumptions and judgments, including future demand for our inventory, the timing of market acceptance of our new products and the risk of obsolescence driven by new product introductions. When we record a charge for excess and obsolete inventories, the amount is applied as a reduction in the cost basis of the specific inventory item for which the charge was recorded. Should these assumptions and judgments not be realized for these or for other reasons, our reserve would be adjusted to reflect actual results. Our industry is subject to technological change and new product development that could result in obsolete inventory. Our reserve for inventory at December 31, 2018 and 2017 was $15.0 million.

Goodwill
Goodwill is allocated to our reporting units, which is either the operating segment or one reporting level below the operating segment. For purposes of performing the impairment test for goodwill, we established the following reporting units: E&P Technology & Services, Optimization Software & Services, Devices, and Ocean Bottom Integrated Technologies. To determine the fair value of our reporting units, we use a discounted future returns valuation method. If we had established different reporting units or utilized different valuation methodologies, our impairment test results could differ. Additionally, we compared the sum of the estimated fair values of the individual reporting units less consolidated debt to our overall market capitalization as reflected by our stock price.
We evaluate the carrying value of our goodwill at least annually for impairment, or more frequently if facts and circumstances indicate that it is more likely than not impairment has occurred. We formally evaluate the carrying value of our goodwill for impairment as of December 31 for each of our reporting units. We first perform a qualitative assessment by evaluating relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If we are unable to conclude qualitatively that it is more likely than not that a reporting unit’s fair value exceeds its carrying value, then we will use a two-step quantitative assessment of the fair value of a reporting unit. If the carrying value of a reporting unit of an entity that includes goodwill is determined to be more than the fair value of the reporting unit, there exists the possibility of impairment of goodwill. An impairment loss of goodwill is measured in two steps by first allocating the fair value of the reporting unit to net assets and liabilities including recorded and unrecorded other intangible assets to determine the implied carrying value of goodwill. The next step is to measure the difference between the carrying value of goodwill and the implied carrying value of goodwill, and, if the implied carrying value of goodwill is less than the carrying value of goodwill, an impairment loss is recorded equal to the difference.
The goodwill balance as of December 31, 2018 was comprised of $20.0 million in our Optimization Software & Services and $2.9 million in our E&P Technology & Services reporting units. Based on our qualitative assessment performed as of December 31, 2018, we concluded it was more likely than not that the fair values of our E&P Technology & Services, and Optimization Software & Services reporting units exceeded their carrying values. Accordingly, no further testing was required and no impairment was recognized. However, if the market value of our shares declines for a prolonged period, and if management's judgments and assumptions regarding future industry conditions and operations diminish, it is reasonably possible that our expectations of future cash flows may decline and ultimately result in a goodwill impairment for our E&P Technology & Services and Optimization Software & Services reporting units.
Property, Plant, Equipment and Seismic Rental Equipment
Property, plant, equipment and seismic rental equipment are stated at cost. Depreciation expense is provided straight-line over their estimated useful lives.
Expenditures for renewals and betterments are capitalized; repairs and maintenance are charged to expense as incurred. The cost and accumulated depreciation of assets sold or otherwise disposed of are removed from the accounts and any gain or loss is reflected in operating expenses.
We evaluate the recoverability of our property, plant, equipment and seismic rental equipment, when indicators of impairment exist, relying on a number of factors including operating results, business plans, economic projections and anticipated future cash flows. Impairment in the carrying value of an asset held for use is recognized whenever anticipated future undiscounted cash flows from an asset are estimated to be less than its carrying value. The amount of the impairment recognized is the difference between the carrying value of the asset and its fair value. For 2018, we identified an indicator of impairment as it relates to our cable-based ocean bottom acquisition technologies. As a result, we recognized an impairment charge of $36.6 million.
Deferred Tax Assets
We established a valuation allowance on a substantial majority of our U.S. net deferred tax assets. A valuation allowance is established or maintained when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. We will continue to record a valuation allowance for the substantial majority of all of our deferred tax assets until there is sufficient evidence to warrant reversal. In the event our expectations of future operating results change, an additional valuation allowance may be required to be established on our existing unreserved net U.S. deferred tax assets. As a result of passage of the Tax Cut and Jobs Act (the “Act”) on December 22, 2017, the Company’s U.S. deferred tax assets, liabilities, and associated valuation allowance as of December 31, 2018 and 2017 have been re-measured at the new U.S. federal tax rate of 21%.
Stock-Based Compensation

We estimate the value of stock-based payment awards on the date of grant using an option pricing model such as Black-Scholes or Monte Carlo simulation. The determination of the fair value of stock-based payment awards is affected by our stock price as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, expected stock price volatility over the term of the awards, actual and projected stock-based instrument exercise behaviors, risk-free interest rate and expected dividends. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. We recognize stock-based compensation expense on the straight-line basis over the requisite service period of each award that are ultimately expected to vest. As it relates to our SARs, in the event that the market price of our common stock increases, our expectation of participants’ expected exercise behavior and risk free interest rate change in the future, we may have to recognize additional SARs expense that could ultimately affect our operating results and cash flows.

Foreign Sales Risks
For 2018, we recognized $68.9 million of sales to customers in Latin America, $31.1 million of sales to customers in Europe, $17.8 million of sales to customers in Asia Pacific, $10.8 million of sales to customers in Africa, $5.5 million of sales to customers in the Middle East and $1.4 million of sales to customers in the Commonwealth of Independent States, or former Soviet Union (“CIS”). The majority of our foreign sales are denominated in U.S. dollars. For 2018, 2017 and 2016, international sales comprised 75%, 76% and 78%, respectively, of total net revenues. The volatility in oil prices have continued to impact the global market through 2018.  Our results of operations, liquidity and financial condition related to our operations in Russia are primarily denominated in U.S. dollars. To the extent that world events or economic conditions negatively affect our future sales to customers in many regions of the world, as well as the collectability of our existing receivables, our future results of operations, liquidity and financial condition would be adversely affected.
Off-Balance Sheet Arrangements
Variable interest entities. As of December 31, 2018, our investment in INOVA Geophysical constitutes an investment in a variable interest entity, as that term is defined in Accounting Standards Codification Topic 810-10 “Consolidation – Overall” and as defined in Item 303(a)(4)(ii) of SEC Regulation S-K. See Footnote 1 “Summary of Significant Accounting Policies-Equity Method Investments” of Footnotes to Consolidated Financial Statements included elsewhere in this Form 10-K for additional information.
Indemnification
In the ordinary course of our business, we enter into contractual arrangements with our customers, suppliers and other parties under which we may agree to indemnify the other party to such arrangement from certain losses it incurs relating to our products or services or for losses arising from certain events as defined within the particular contract. Some of these indemnification obligations may not be subject to maximum loss limitations. Historically, payments we have made related to these indemnification obligations have been immaterial.
Item 7A. Quantitative and Qualitative Disclosures about Market Risk
Market risk is the risk of loss from adverse changes in market prices and rates. Our primary market risks include risks related to interest rates and foreign currency exchange rates.
Interest Rate Risk
As of December 31, 2018, we had outstanding total indebtedness of approximately $121.7 million. As of December 31, 2018, all of this indebtedness, other than borrowings under our Credit Facility (described below) accrues interest at fixed interest rates.
As our borrowings under the Credit Facility are subject to variable interest rates, we are subject to interest rate risk to the extent we have outstanding balances under the Credit Facility. We are therefore impacted by changes in LIBOR and/or our bank's base rates. We may, from time to time, use derivative financial instruments to help mitigate rising interest rates under our Credit Facility. We do not use derivatives for trading or speculative purposes and only enter into contracts with major financial institutions based on their credit rating and other factors.

Foreign Currency Exchange Rate Risk
Our operations are conducted in various countries around the world, and we receive revenue from these operations in a number of different currencies with the most significant of our international operations using British Pounds Sterling. As such, our earnings are subject to movements in foreign currency exchange rates when transactions are denominated in currencies other than the U.S. dollar, which is our functional currency, or the functional currency of many of our subsidiaries, which is not necessarily the U.S. dollar. To the extent that transactions of these subsidiaries are settled in currencies other than the U.S. dollar, a devaluation of these currencies versus the U.S. dollar could reduce the contribution from these subsidiaries to our consolidated results of operations as reported in U.S. dollars.
Through our subsidiaries, we operate in a wide variety of jurisdictions, including the United Kingdom, Brazil, Mexico, China, Canada, Russia, the United Arab Emirates, Egypt and other countries. Our financial results may be affected by changes in foreign currency exchange rates. Our consolidated balance sheets at December 31, 2018 reflected approximately $9.2 million of net working capital related to our foreign subsidiaries, a majority of which is within the United Kingdom and Brazil. Our foreign subsidiaries receive their income and pay their expenses primarily in their local currencies. To the extent that transactions of these subsidiaries are settled in the local currencies, a devaluation of these currencies versus the U.S. dollar could reduce the contribution from these subsidiaries to our consolidated results of operations as reported in U.S. dollars. For the year ended December 31, 2018, we recorded net foreign currency losses of approximately $0.4 million in other income, a majority of these losses are due to currency fluctuations related to our operations within Brazil and the United Kingdom.
Item 8. Financial Statements and Supplementary Data
The financial statements and related notes thereto required by this item begin at page F-1 hereof.
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Not applicable.
Item 9A. Controls and Procedures
(a) Evaluation of Disclosure Controls and Procedures. Disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file with or submit to the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reported within the time period specified by the SEC’s rules and forms. Disclosure controls and procedures are defined in Rule 13a-15(e) under the Exchange Act, and they include, without limitation, controls and procedures designed to ensure that information required to be disclosed under the Exchange Act is accumulated and communicated to management, including the principal executive officer and the principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.
Our management carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of December 31, 2018. Based upon that evaluation, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures were effective as of December 31, 2018.
(b)Management’s Report on Internal Control Over Financial Reporting. Our management is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rules 13a-15(f) under the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that:
(i)pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of our company;
(ii)provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of our company are being made only in accordance with authorizations of our management and directors; and
(iii)provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, we assessed the effectiveness of our internal control over financial reporting as of December 31, 2018 based upon criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”).

The independent registered public accounting firm that has also audited our consolidated financial statements included in this Annual Report on Form 10-K has issued an audit report on our internal control over financial reporting. This report appears below.
(c)Changes in Internal Control over Financial Reporting. There was not any change in our internal control over financial reporting that occurred during the three months ended December 31, 2018, which has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.


Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders
ION Geophysical Corporation

Opinion on internal control over financial reporting
We have audited the internal control over financial reporting of ION Geophysical Corporation (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2018, based on criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in the 2013 Internal Control-Integrated Framework issued by COSO.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the consolidated financial statements of the Company as of and for the year ended December 31, 2018, and our report dated February 7, 2019 expressed an unqualified opinion on those financial statements.
Basis for opinion
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Definition and limitations of internal control over financial reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ GRANT THORNTON LLP
Houston, Texas
February 7, 2019

Item 9B. Other Information
Not applicable.

PART III
Item 10. Directors, Executive Officers and Corporate Governance
Reference is made to the information appearing in the definitive proxy statement, under “Item 1Election of Directors,” for our annual meeting of stockholders to be held on May 15, 2019 (the “2019 Proxy Statement”) to be filed with the SEC with respect to Directors, Executive Officers and Corporate Governance, which is incorporated herein by reference and made a part hereof in response to the information required by Item 10.
Item 11. Executive Compensation
Reference is made to the information appearing in the 2019 Proxy Statement, under “Executive Compensation,” to be filed with the SEC with respect to Executive Compensation, which is incorporated herein by reference and made a part hereof in response to the information required by Item 11.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Reference is made to the information appearing in the 2019 Proxy Statement, under “Item 1Ownership of Equity Securities of ION” and “Equity Compensation Plan Information,” to be filed with the SEC with respect to Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters, which is incorporated herein by reference and made a part hereof in response to the information required by Item 12.
Item 13. Certain Relationships and Related Transactions, and Director Independence
Reference is made to the information appearing in the 2019 Proxy Statement, under “Item 1Certain Transactions and Relationships,” to be filed with the SEC with respect to Certain Relationships and Related Transactions and Director Independence, which is incorporated herein by reference and made a part hereof in response to the information required by Item 13.
Item 14. Principal Accounting Fees and Services
Reference is made to the information appearing in the 2019 Proxy Statement, under “Principal Auditor Fees and Services,” to be filed with the SEC with respect to Principal Accountant Fees and Services, which is incorporated herein by reference and made a part hereof in response to the information required by Item 14.



PART IV
Item 15. Exhibits and Financial Statement Schedules
(a) List of Documents Filed
(1) Financial Statements
The financial statements filed as part of this report are listed in the “Index to Consolidated Financial Statements” on page F-1 hereof.
(2) Financial Statement Schedules
The following financial statement schedule is listed in the “Index to Consolidated Financial Statements” on page F-1 hereof, and is included as part of this Annual Report on Form 10-K:
Schedule II — Valuation and Qualifying Accounts
All other schedules are omitted because they are not applicable or the requested information is shown in the financial statements or noted therein.
(3) Exhibits
3.1

3.2
4.1
4.2
4.3
4.4
**10.1
**10.2
**10.3
**10.4
**10.5

10.6
10.7
10.8
10.9
**10.10
10.11
**10.12
10.13
10.14
10.15
10.16
**10.17
**10.18
**10.19
**10.20
**10.21
10.22
10.23
* **10.24

* **10.25
* **10.26
*21.1
*23.1
*24.1
*31.1
*31.2
*32.1
*32.2
*101
The following materials are formatted in Extensible Business Reporting Language (XBRL): (i) Consolidated Balance Sheets at December 31, 2018 and 2017, (ii) Consolidated Statements of Operations for the years ended December 31, 2018, 2017 and 2016, (iii) Comprehensive Income (Loss) for the years ended December 31, 2018, 2017 and 2016, (iv) Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016, (v) Consolidated Statements of Stockholders’ Equity for the years ended December 31, 2018, 2017 and 2016, (vi) Footnotes to Consolidated Financial Statements and (vii) Schedule II – Valuation and Qualifying Accounts.
*Filed herewith.
**Management contract or compensatory plan or arrangement.
(b)Exhibits required by Item 601 of Regulation S-K.
Reference is made to subparagraph (a) (3) of this Item 15, which is incorporated herein by reference.
(c)Not applicable.

SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Houston, State of Texas, on February 7, 2019.
ION GEOPHYSICAL CORPORATION
By/s/ R. Brian Hanson
R. Brian Hanson
President and Chief Executive Officer

POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints R. Brian Hanson and Matthew Powers and each of them, as his or her true and lawful attorneys-in-fact and agents with full power of substitution and re-substitution for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all documents relating to the Annual Report on Form 10-K for the year ended December 31, 2018, including any and all amendments and supplements thereto, and to file the same with all exhibits thereto and other documents in connection therewith with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully as to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or their or his or her substitute or substitutes may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Annual Report on Form 10-K has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated.
NameCapacitiesDate
/s/ R. BRIAN HANSONPresident, Chief Executive Officer and Director
(Principal Executive Officer)
February 7, 2019
R. Brian Hanson
/s/ STEVEN A. BATEExecutive Vice President and Chief
Financial Officer (Principal Financial Officer)
February 7, 2019
Steven A. Bate
/s/ SCOTT SCHWAUSCHVice President and Corporate Controller
(Principal Accounting Officer)
February 7, 2019
Scott Schwausch
/s/ JAMES M. LAPEYRE, JR.Chairman of the Board of Directors and DirectorFebruary 7, 2019
James M. Lapeyre, Jr.
/s/ DAVID H. BARRDirectorFebruary 7, 2019
David H. Barr

DirectorFebruary 7, 2019
Zheng HuaSheng

NameCapacitiesDate
/s/ MICHAEL C. JENNINGSDirectorFebruary 7, 2019
Michael C. Jennings
/s/ FRANKLIN MYERSDirectorFebruary 7, 2019
Franklin Myers
/s/ S. JAMES NELSON, JR.DirectorFebruary 7, 2019
S. James Nelson, Jr.
/s/ JOHN N. SEITZDirectorFebruary 7, 2019
John N. Seitz


ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
Page
ION Geophysical Corporation and Subsidiaries:
Report of Independent Registered Public Accounting FirmsF-2
Consolidated Balance Sheets — December 31, 2018 and 2017F-3
Consolidated Statements of Operations — Years ended December 31, 2018, 2017 and 2016F-4
Consolidated Statements of Comprehensive Loss — Years ended December 31, 2018, 2017 and 2016F-5
Consolidated Statements of Cash Flows — Years ended December 31, 2018, 2017 and 2016F-6
Consolidated Statements of Stockholders’ Equity — Years ended December 31, 2018, 2017 and 2016F-8
Footnotes to Consolidated Financial StatementsF-9
Schedule II — Valuation and Qualifying AccountsS-1



Report of Independent Registered Public Accounting Firm

Board of Directors and Stockholders
ION Geophysical Corporation

Opinion on the financial statements
We have audited the accompanying consolidated balance sheets of ION Geophysical Corporation (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2018 and 2017, the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2018, and the related notes and schedule included under Item 15(a) (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in the 2013 Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated February 7, 2019 expressed an unqualified opinion.
Basis for opinion
These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ GRANT THORNTON LLP

We have served as the Company’s auditor since 2014.

Houston, Texas
February 7, 2019


ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS

 December 31,
 2018 2017
 (In thousands, except share data)
ASSETS
Current assets:   
Cash and cash equivalents$33,551
 $52,056
Accounts receivable, net26,128
 19,478
Unbilled receivables44,032
 37,304
Inventories, net14,130
 14,508
Prepaid expenses and other current assets7,782
 7,643
Total current assets125,623
 130,989
Deferred income tax asset, net7,191
 1,753
Property, plant, equipment and seismic rental equipment, net13,041
 52,153
Multi-client data library, net73,544
 89,300
Goodwill22,915
 24,089
Other assets2,435
 2,785
Total assets$244,749
 $301,069
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:   
Current maturities of long-term debt$2,228
 $40,024
Accounts payable34,913
 24,951
Accrued expenses31,411
 38,697
Accrued multi-client data library royalties29,256
 27,035
Deferred revenue7,710
 8,910
Total current liabilities105,518
 139,617
Long-term debt, net of current maturities119,513
 116,720
Other long-term liabilities11,894
 13,926
Total liabilities236,925
 270,263
Equity:   
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 14,015,615 and 12,019,701 shares at December 31, 2018 and 2017, respectively.140
 120
Additional paid-in capital952,626
 903,247
Accumulated deficit(926,092) (854,921)
Accumulated other comprehensive loss(20,442) (18,879)
Total stockholders’ equity6,232
 29,567
Noncontrolling interests1,592
 1,239
Total equity7,824
 30,806
Total liabilities and equity$244,749
 $301,069
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS
 Years Ended December 31,
 2018 2017 2016
 (In thousands, except per share data)
Service revenues$139,038
 $159,410
 $130,640
Product revenues41,007
 38,144
 42,168
Total net revenues180,045
 197,554
 172,808
Cost of services100,557
 103,124
 115,763
Cost of products19,868
 18,791
 21,013
Gross profit59,620
 75,639
 36,032
Operating expenses:     
Research, development and engineering18,182
 16,431
 17,833
Marketing and sales21,793
 20,778
 17,371
General, administrative and other operating expenses37,364
 47,129
 43,999
Impairment of long-lived assets36,553
 
 
Total operating expenses113,892
 84,338
 79,203
Loss from operations(54,272) (8,699) (43,171)
Interest expense, net(12,972) (16,709) (18,485)
Other income (expense), net(436) (3,945) 1,350
Loss before income taxes(67,680) (29,353) (60,306)
Income tax expense2,718
 24
 4,421
Net loss(70,398) (29,377) (64,727)
Net income attributable to noncontrolling interests(773) (865) (421)
Net loss attributable to ION$(71,171) $(30,242) $(65,148)
Net loss per share:     
Basic$(5.20) $(2.55) $(5.71)
Diluted$(5.20) $(2.55) $(5.71)
Weighted average number of common shares outstanding:     
Basic13,692
 11,876
 11,400
Diluted13,692
 11,876
 11,400
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS

 Years Ended December 31,
 2018 2017 2016
 (In thousands)
Net loss$(70,398) $(29,377) $(64,727)
Other comprehensive income (loss), net of taxes, as appropriate:     
Foreign currency translation adjustments(1,563) 2,869
 (6,967)
Comprehensive net loss(71,961) (26,508) (71,694)
Comprehensive income attributable to noncontrolling interests(773) (865) (421)
Comprehensive net loss attributable to ION$(72,734) $(27,373) $(72,115)
See accompanying Footnotes to Consolidated Financial Statements.


ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
 Years Ended December 31,
 2018 2017 2016
 (In thousands)
Cash flows from operating activities:     
Net loss$(70,398) $(29,377) $(64,727)
Adjustments to reconcile net loss to net cash provided by operating activities:     
Depreciation and amortization (other than multi-client library)8,763
 16,592
 21,975
Amortization of multi-client data library48,988
 47,102
 33,335
Impairment of long-lived assets36,553
 
 
Impairment of multi-client data library
 2,304
 
Stock-based compensation expense3,337
 2,552
 3,267
Accrual (reduction) of loss contingency related to legal proceedings
 5,000
 (1,168)
Loss on bond exchange
 
 2,182
Write-down of excess and obsolete inventory665
 398
 429
Deferred income taxes(6,252) (5,420) (1,181)
Change in operating assets and liabilities:     
Accounts receivable(7,024) 1,692
 20,426
Unbilled receivables(5,245) (23,947) 6,543
Inventories(353) 190
 2,312
Accounts payable, accrued expenses and accrued royalties(7,600) 1,443
 (5,085)
Deferred revenue(1,112) 5,131
 (2,759)
Other assets and liabilities6,776
 3,952
 (14,556)
Net cash provided by operating activities7,098
 27,612
 993
Cash flows from investing activities:     
Investment in multi-client data library(28,276) (23,710) (14,884)
Purchase of property, plant, equipment and seismic rental equipment(1,514) (1,063) (1,458)
Proceeds from sale of cost method investments
 
 2,698
Net cash used in investing activities(29,790) (24,773) (13,644)
Cash flows from financing activities:     
Borrowings under revolving line of credit
 
 15,000
Repayments under revolving line of credit(10,000) 
 (5,000)
Payments on notes payable and long-term debt(30,807) (4,816) (23,634)
Cost associated with issuance of debt(1,247) (53) (6,744)
Net proceeds from issuance of stocks46,999
 
 
Repurchase of common stock
 
 (964)
Proceeds from employee stock purchases and exercise of stock options214
 1,619
 
Dividend payment to noncontrolling interest(200) (100) 
Other financing activities(1,151) (243) (252)
Net cash provided by (used in) financing activities3,808
 (3,593) (21,594)
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash319
 (260) 1,386
Net decrease in cash, cash equivalents and restricted cash(18,565) (1,014) (32,859)
Cash, cash equivalents and restricted cash at beginning of period52,419
 53,433
 86,292
Cash, cash equivalents and restricted cash at end of period$33,854
 $52,419
 $53,433




The following table is a reconciliation of cash, cash equivalents and restricted cash:
 December 31,
 2018 2017 2016
 (In thousands)
 Cash and cash equivalents$33,551
 $52,056
 $52,652
 Restricted cash included in prepaid expenses and other current assets
 60
 260
 Restricted cash included in other long-term assets303
 303
 521
Total cash, cash equivalents, and restricted cash shown in consolidated statements of cash flows$33,854
 $52,419
 $53,433
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY
 Common Stock Additional Paid-In Capital Accumulated Deficit Accumulated Other Comprehensive Loss Treasury Stock Noncontrolling Interests Total Equity
 (In thousands, except shares)Shares Amount 
Balance at January 1, 2016 (a)
10,702,689
 $107
 $894,715
 $(759,531) $(14,781) $(8,551) $81
 $112,040
Net (loss) income
 
 
 (65,148) 
 
 421
 (64,727)
Translation adjustment
 
 
 
 (6,967) 
 7
 (6,960)
Stock-based compensation expense
 
 3,267
 
 
 
 
 3,267
Vesting of restricted stock units/awards40,495
 
 
 
 
 
 
 
Purchase of treasury shares(155,304) (1) 
 
 
 (963) 
 (964)
Restricted stock cancelled for employee minimum income taxes(4,973) 
 (22) 
 
 
 
 (22)
Issuance of stock for the ESPP4,100
 
 23
 
 
 
 
 23
Issuance of stock in bond exchange1,205,440
 12
 1,215
 
 
 9,514
 
 10,741
Balance at December 31, 201611,792,447
 118
 899,198
 (824,679) (21,748) 
 509
 53,398
Net (loss) income
 
 
 (30,242) 
 
 865
 (29,377)
Translation adjustment
 
 
 
 2,869
 
 (35) 2,834
Dividend payment to noncontrolling interest
 
 
 
 
 
 (100) (100)
Stock-based compensation expense
 
 2,552
 
 
 
 
 2,552
Exercise of stock options15,000
 
 46
 
 
 
 
 46
Vesting of restricted stock units/awards115,576
 1
 (1) 
 
 
 
 
Employee purchases of unregistered shares of common stock120,567
 1
 1,572
 
 
 
 
 1,573
Restricted stock cancelled for employee minimum income taxes(23,889) 
 (120) 
 
 
 
 (120)
Balance at December 31, 201712,019,701
 120
 903,247
 (854,921) (18,879) 
 1,239
 30,806
Net (loss) income
 
 
 (71,171) 
 
 773
 (70,398)
Translation adjustment
 
 
 
 (1,563) 
 (220) (1,783)
Dividend payment to noncontrolling interest
 
 
 
 
 
 (200) (200)
Stock-based compensation expense
 
 3,337
 
 
 
 
 3,337
Exercise of stock options70,086
 1
 213
 
 
 
 
 214
Vesting of restricted stock units/awards151,852
 1
 (1) 
 
 
 
 
Restricted stock cancelled for employee minimum income taxes(46,024) 
 (1,151) 
 
 
 
 (1,151)
Public equity offering1,820,000
 18
 46,981
 
 
 
 
 46,999
Balance at December 31, 201814,015,615
 $140
 $952,626
 $(926,092) $(20,442) $
 $1,592
 $7,824
(a)The figures for January 1, 2016, set forth in the tables above have been retroactively adjusted to reflect the one-for-fifteen reverse stock split completed on February 4, 2016.
See accompanying Footnotes to Consolidated Financial Statements.

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
FOOTNOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(1)    Summary of Significant Accounting Policies
General Description and Principles of Consolidation
ION Geophysical Corporation and its subsidiaries offer a full suite of services and products for seismic data acquisition and processing. The consolidated financial statements include the accounts of ION Geophysical Corporation and its majority-owned subsidiaries (collectively referred to as the “Company” or “ION”). Intercompany balances and transactions have been eliminated. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation.
Use of Estimates
The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates are made at discrete points in time based on relevant market information. These estimates may be subjective in nature and involve uncertainties and matters of judgment and, therefore, cannot be determined with precision. Areas involving significant estimates include, but are not limited to, accounts and unbilled receivables, inventory valuation, sales forecasts related to multi-client data libraries, goodwill and intangible asset valuation and deferred taxes. Actual results could materially differ from those estimates.
Cash and Cash Equivalents
The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. The Company places its temporary cash investments with high credit quality financial institutions. At times such investments may be in excess of the Federal Deposit Insurance Corporation insurance limit. At December 31, 2018 and 2017, there was $0.3 million and $0.4 million, respectively, of long-term and short-term restricted cash used to secure standby and commercial letters of credit, which is included within “Other long-term assets” and “Prepaid expenses and other current assets” in the Consolidated Balance Sheets.
Accounts and Unbilled Receivables
Accounts and unbilled receivables are recorded at cost, less the related allowance for doubtful accounts. The Company considers current information and events regarding the customers’ ability to repay their obligations, such as the length of time the receivable balance is outstanding, the customers’ credit worthiness and historical experience. Unbilled receivables relate to revenues recognized on multi-client surveys, imaging services and devices equipment repairs on a proportionate basis, and on licensing of multi-client data libraries for which invoices have not yet been presented to the customer.
Inventories
Inventories are stated at the lower of cost (primarily first-in, first-out method) or net realizable value. The Company provides reserves for estimated obsolescence or excess inventory equal to the difference between cost of inventory and its estimated net realizable value based upon assumptions about future demand for the Company’s products, market conditions and the risk of obsolescence driven by new product introductions.
Property, Plant, Equipment and Seismic Rental Equipment
Property, plant, equipment and seismic rental equipment are stated at cost. Depreciation expense is provided straight-line over the following estimated useful lives:
Years
Machinery and equipment3-7
Buildings5-25
Seismic rental equipment3-5
Leased equipment and other3-10
Expenditures for renewals and betterments are capitalized; repairs and maintenance are charged to expense as incurred. The cost and accumulated depreciation of assets sold or otherwise disposed of are removed from the accounts and any gain or loss is reflected in operating expenses.

The Company evaluates the recoverability of long-lived assets, including property, plant, equipment and seismic rental equipment, when indicators of impairment exist, relying on a number of factors including operating results, business plans, economic projections and anticipated future cash flows. Impairment in the carrying value of an asset held for use is recognized whenever anticipated future undiscounted cash flows from an asset are estimated to be less than its carrying value. The amount of the impairment recognized is the difference between the carrying value of the asset and its fair value. For 2018, the Company identified an indicator of impairment as it relates to its cable-based ocean bottom acquisition technologies. As a result, the Company recognized an impairment charge of $36.6 million.
Multi-Client Data Library
The multi-client data library consists of seismic surveys that are offered for licensing to customers on a non-exclusive basis. The capitalized costs include costs paid to third parties for the acquisition of data and related activities associated with the data creation activity and direct internal processing costs, such as salaries, benefits, computer-related expenses and other costs incurred for seismic data project design and management. For 2018, 2017 and 2016, the Company capitalized, as part of its multi-client data library, $11.9 million, $12.7 million and $6.6 million, respectively, of direct internal processing costs. At December 31, 2018 and 2017, multi-client data library costs and accumulated amortization consisted of the following (in thousands):
 December 31,
 2018 2017
Gross costs of multi-client data creation$972,309
 $939,077
Less accumulated amortization(776,860) (727,872)
Less impairments to multi-client data library(121,905) (121,905)
Multi-client data library, net$73,544
 $89,300
The Company’s method of amortizing the costs of an in-process multi-client data library (the period during which the seismic data is being acquired and/or processed, referred to as the “New Venture” phase) consists of determining the percentage of actual revenue recognized to the total estimated revenues (which includes both revenues estimated to be realized during the New Venture phase and estimated revenues from the licensing of the resulting “on-the-shelf” data survey) and multiplying that percentage by the total cost of the project (the sales forecast method). The Company considers a multi-client data survey to be complete when all work on the creation of the seismic data is finished and that data survey is available for licensing. Once a multi-client data survey is complete, the data survey is considered “on-the-shelf” and the Company’s method of amortization is then the greater of (i) the sales forecast method or (ii) the straight-line basis over a four-year period. The greater amount of amortization resulting from the sales forecast method or the straight-line amortization policy is applied on a cumulative basis at the individual survey level. Under this policy, the Company first records amortization using the sales forecast method. The cumulative amortization recorded for each survey is then compared with the cumulative straight-line amortization. The four-year period utilized in this cumulative comparison commences when the data survey is determined to be complete. If the cumulative straight-line amortization is higher for any specific survey, additional amortization expense is recorded, resulting in accumulated amortization being equal to the cumulative straight-line amortization for such survey. The Company has determined the amortization period of four years based upon its historical experience that indicates that the majority of its revenues from multi-client surveys are derived during the acquisition and processing phases and during four years subsequent to survey completion.
The Company estimates the ultimate revenue expected to be derived from a particular seismic data survey over its estimated useful economic life to determine the costs to amortize, if greater than straight-line amortization. That estimate is made by the Company at the project’s initiation. For a completed multi-client survey, the Company reviews the estimate quarterly. If during any such review, the Company determines that the ultimate revenue for a survey is expected to be materially more or less than the original estimate of ultimate revenue for such survey, the Company decreases or increases (as the case may be) the amortization rate attributable to the future revenue from such survey. In addition, in connection with such reviews, the Company evaluates the recoverability of the multi-client data library, and, if required, records an impairment charge with respect to such data.
Equity Method Investment
The Company determined that INOVA Geophysical is a variable interest entity because the Company’s voting rights with respect to INOVA Geophysical are not proportionate to its ownership interest and substantially all of INOVA Geophysical’s activities are conducted on behalf of the Company and BGP, a related party to the Company. The Company is not the primary beneficiary of INOVA Geophysical because it does not have the power to direct the activities of INOVA Geophysical that most significantly impact its economic performance. Accordingly, the Company does not consolidate INOVA Geophysical, but instead accounts for INOVA Geophysical using the equity method of accounting. Under this method, an investment is carried at the acquisition cost, plus the Company’s equity in undistributed earnings or losses since acquisition, less distributions received.

At December 31, 2014, the Company fully impaired its investment in INOVA reducing its equity investment in INOVA and its share of INOVA’s accumulated other comprehensive loss, both to zero. As of December 31, 2018, the carrying value of this investment remains zero. The Company no longer records its equity in losses or earnings and has no obligation, implicit or explicit, to fund any expenses of INOVA Geophysical.
Noncontrolling Interests
The Company has non-redeemable noncontrolling interests. Non-redeemable noncontrolling interests in majority-owned affiliates are reported as a separate component of equity in “Noncontrolling interests” in the Consolidated Balance Sheets. Net income attributable to noncontrolling interests is stated separately in the Consolidated Statements of Operations. The activity for this noncontrolling interest relates to proprietary processing projects in Brazil.
Goodwill
Goodwill is allocated to reporting units, which are either the operating segment or one reporting level below the operating segment. For purposes of performing the impairment test for goodwill, the Company established the following reporting units: E&P Technology & Services, Optimization Software & Services, Devices and Ocean Bottom Integrated Technologies.
The Company is required to evaluate the carrying value of its goodwill at least annually for impairment, or more frequently if facts and circumstances indicate that it is more likely than not impairment has occurred. The Company formally evaluates the carrying value of its goodwill for impairment as of December 31 for each of its reporting units. The Company first performs a qualitative assessment by evaluating relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit exceeds its carrying amount. If the Company is unable to conclude qualitatively that it is more likely than not that a reporting unit’s fair value exceeds its carrying value, then it will use a two-step quantitative assessment of the fair value of a reporting unit. To determine the fair value of these reporting units, the Company uses a discounted future returns valuation model, which includes a variety of level 3 inputs. The key inputs for the model include the operational three-year forecast for the Company and the then-current market discount factor. Additionally, the Company compares the sum of the estimated fair values of the individual reporting units less consolidated debt to the Company’s overall market capitalization as reflected by the Company’s stock price. If the carrying value of a reporting unit that includes goodwill is determined to be more than the fair value of the reporting unit, there exists the possibility of impairment of goodwill. An impairment loss of goodwill is measured in two steps by first allocating the fair value of the reporting unit to net assets and liabilities including recorded and unrecorded intangible assets to determine the implied carrying value of goodwill. The next step is to measure the difference between the carrying value of goodwill and the implied carrying value of goodwill, and, if the implied carrying value of goodwill is less than the carrying value of goodwill, an impairment loss is recorded equal to the difference. See further discussion below at Footnote 11 “Goodwill.”
Revenue From Contracts With Customers
On January 1, 2018, the Company adopted Accounting Standards Codification Topic 606 - “Revenue from Contracts with Customers” and all the related amendments (“ASC 606”), using the modified retrospective method. This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaborative arrangements and financial instruments. The adoption of ASC 606 did not have a material impact on the Consolidated Balance Sheets or Consolidated Statements of Operations for any of our reporting segments. See further discussion below at Footnote 3 “Revenue from Contracts with Customers.”
Research, Development and Engineering
Research, development and engineering costs primarily relate to activities that are designed to improve the quality of the subsurface image and overall acquisition economics of the Company’s customers. The costs associated with these activities are expensed as incurred. These costs include prototype material and field testing expenses, along with the related salaries and stock-based compensation, facility costs, consulting fees, tools and equipment usage and other miscellaneous expenses associated with these activities.
Stock-Based Compensation

The Company accounts for all stock-based payment awards issued to employees and directors, including employee stock options, restricted stocks units, restricted stocks and stock appreciation rights under the provisions of ASC 718 “Compensation – Stock Compensation” (“ASC 718”). The Company estimates the value of stock-based payment awards on the date of grant using an option pricing model such as Black-Scholes or Monte Carlo simulation. The determination of the fair value of stock-based payment awards is affected by the Company’s stock price as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, expected stock price volatility over the term of the awards, actual and projected stock-based instrument exercise behaviors, risk-free interest rate and expected dividends. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Company recognizes stock-based compensation expense on the straight-line basis over the requisite service period of each award that are ultimately expected to vest.
Income Taxes
Income taxes are accounted for under the liability method. Deferred income tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases, including operating loss and tax credit carryforwards. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply in the years in which those temporary differences are expected to be recovered or settled. The Company records a valuation allowance when it is more likely than not that all or a portion of deferred tax assets will not be realized (see Footnote 7 “Income Taxes”). The effect on deferred income tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.
Debt Issuance Costs
The Company presents debt issuance costs related to a debt liability as a direct deduction from the carrying amount of that debt liability on the Consolidated Balance Sheets and amortizes such costs using the effective interest method whereas debt issuance costs related to line of credit arrangement is presented within “Other assets” on the Consolidated Balance Sheets and amortized ratably over the term of the line of credit arrangement, regardless of whether there are any outstanding borrowings on the line of credit arrangement. 
Foreign Currency Gains and Losses
Assets and liabilities of the Company’s subsidiaries operating outside the United States that have a functional currency other than the U.S. dollar have been translated to U.S. dollars using the exchange rate in effect at the balance sheet date. Results of foreign operations have been translated using the average exchange rate during the periods of operation. Resulting translation adjustments have been recorded as a component of Accumulated Other Comprehensive Loss. Foreign currency transaction gains and losses, as they occur, are included in “Other income (expense), net” on the Consolidated Statements of Operations. Total foreign currency transaction losses were $0.4 million, $1.6 million and $3.3 million for 2018, 2017 and 2016, respectively.
Concentration of Foreign Sales Risk
The majority of the Company’s foreign sales are denominated in U.S. dollars. For 2018, 2017 and 2016, international sales comprised 75%, 76% and 78%, respectively, of total net revenues. Since 2008, global economic problems and uncertainties have generally increased in scope and nature. The volatility in oil prices have continued to impact the global market throughout 2018.  To the extent that world events or economic conditions negatively affect the Company’s future sales to customers in many regions of the world, as well as the collectability of the Company’s existing receivables, the Company’s future results of operations, liquidity and financial condition would be adversely affected.
(2)    Segment and Geographic Information
The Company evaluates and reviews its results based on three business segments: E&P Technology & Services, Operations Optimization, and Ocean Bottom Integrated Technologies. The Company measures segment operating results based on income (loss) from operations.

A summary of segment information follows (in thousands):
 Years Ended December 31,
 2018 2017 2016
Net revenues:     
E&P Technology & Services:     
New Venture$69,685
 $100,824
 $27,362
Data Library47,095
 40,016
 39,989
Total multi-client revenues116,780
 140,840
 67,351
Imaging Services19,740
 16,409
 25,538
Total$136,520
 $157,249
 $92,889
Operations Optimization:     
Devices$22,396
 $23,610
 $26,746
Optimization Software & Services21,129
 16,695
 16,756
Total$43,525
 $40,305
 $43,502
Ocean Bottom Integrated Technologies$
 $
 $36,417
Total$180,045
 $197,554
 $172,808
Gross profit (loss):     
E&P Technology & Services$43,369
 $65,196
 $4,708
Operations Optimization22,293
 20,076
 21,745
Ocean Bottom Integrated Technologies(6,042) (9,633) 9,579
Total$59,620
 $75,639
 $36,032
Gross margin:     
E&P Technology & Services32% 41% 5%
Operations Optimization51% 50% 50%
Ocean Bottom Integrated Technologies% % 26%
Total33% 38% 21%
Income (loss) from operations:     
E&P Technology & Services$21,758
 $42,505
 $(16,446)
Operations Optimization7,295
 8,022
 9,652
Ocean Bottom Integrated Technologies(47,644)
(a) 
(16,259) (1,756)
Support and other(35,681) (42,967) (34,621)
Loss from operations(54,272) (8,699) (43,171)
Interest expense, net(12,972) (16,709) (18,485)
Other income (expense), net(436) (3,945) 1,350
Loss before income taxes$(67,680) $(29,353) $(60,306)
(a)    Includes a charge of $36.6 million to write-down the cable-based ocean bottom acquisition technologies associated with the Ocean Bottom Integrated Technologies segment. This impairment relates to property, plant, equipment and seismic rental equipment of $21.3 million within the Operations Optimization segment and $15.3 million within the Ocean Bottom Integrated Technologies segment.
 Years Ended December 31,
 2018 2017 2016
Depreciation and amortization (including multi-client data library):     
E&P Technology & Services$51,673
 $53,663
 $44,100
Operations Optimization995
 1,349
 1,780
Ocean Bottom Integrated Technologies4,231
 7,001
 7,511
Support and other852
 1,681
 1,919
Total$57,751
 $63,694
 $55,310

 December 31,
 2018 2017
Total assets:   
E&P Technology & Services$165,132
 $156,555
Operations Optimization51,783
 74,361
Ocean Bottom Integrated Technologies1,177
 20,828
Support and other26,657
 49,325
Total$244,749
(a) 
$301,069
(a)    Balance is net of impairment charge of $36.6 million related to the cable-based ocean bottom acquisition technologies.
A summary of total assets by geographic area follows (in thousands):
 December 31,
 2018 2017
North America$86,614
 $116,598
Latin America69,418
 55,661
Middle East52,037
 70,308
Europe31,566
 51,876
Other5,114
 6,626
Total$244,749
 $301,069
A summary of property, plant, equipment and seismic equipment less accumulated depreciation and impairment by geographic area follows (in thousands):
 December 31,
 2018 2017
North America$11,663
 $10,609
Europe1,140
 20,725
Latin America143
 170
Middle East36
 20,543
Other59
 106
Total$13,041
(a) 
$52,153
(a)    Balance is net of impairment charge of $36.6 million related to the cable-based ocean bottom acquisition technologies.
Intersegment sales are insignificant for all periods presented. Support and other assets include all assets specifically related to support personnel and operation and a majority of cash and cash equivalents. Depreciation and amortization expense is allocated to segments based upon use of the underlying assets.
A summary of net revenues by geographic area follows (in thousands):
 Years Ended December 31,
 2018 2017 2016
Latin America$68,871
 $68,241
 $24,090
North America44,474
 48,120
 38,005
Europe31,077
 44,930
 41,674
Asia Pacific17,817
 18,896
 16,226
Africa10,837
 6,837
 41,417
Middle East5,526
 2,308
 9,467
Commonwealth of Independent States1,443
 8,222
 1,929
Total$180,045
 $197,554
 $172,808
Net revenues are attributed to geographic areas on the basis of the ultimate destination of the equipment or service, if known, or the geographic area imaging services are provided. If the ultimate destination of such equipment is not known, net revenues are attributed to the geographic area of initial shipment.

(3)     Revenue from Contracts with Customers
The Company derives revenue from the sale or license of (i) multi-client and proprietary data, imaging services and E&P Advisors consulting services within its E&P Technology & Services segment; (ii) seismic data acquisition systems and other seismic equipment, (iii) seismic command and control software systems and software solutions for operations management within its Operations Optimization segment; and (iv) a full suite of technology and services within its Ocean Bottom Integrated Technologies segment. All revenues of the E&P Technology & Services and Ocean Bottom Integrated Technologies segments and the services component of revenues for the Optimization Software & Services group as part of the Operations Optimization segment are classified as services revenues. All other revenues are classified as product revenues.
The Company uses a five-step model to determine proper revenue recognition from customer contracts. Revenue is recognized when (i) a contract is approved by all parties; (ii) the goods or services promised in the contract are identified; (iii) the consideration the Company expects to receive in exchange for the goods or services promised is determined; (iv) the consideration is allocated to the goods and services in the contract; and (v) control of the promised goods or services is transferred to the customer. The Company does not disclose the value of contractual future performance obligations such as backlog with an original expected length of one year or less within the footnotes.
Multi-client and Proprietary Surveys, Imaging Services and E&P Advisors Services - As multi-client seismic surveys are being designed, acquired or processed (the “New Venture” phase), the Company enters into non-exclusive licensing arrangements with its customers, who pre-fund or underwrite these programs in part. License revenues from these surveys are recognized during the New Venture phase as the seismic data is acquired and/or processed on a proportionate basis as work is performed and control is transferred to the customer. Under this method, the Company recognizes revenue based upon quantifiable measures of progress, such as kilometers acquired or surveys of performance completed to date. Upon completion of a multi-client seismic survey, it is considered “on-the-shelf,” and licenses to the survey data are granted to customers on a non-exclusive basis.
The Company also performs seismic surveys, imaging and other services under contracts with specific customers, whereby the seismic data is owned by those customers. The Company recognizes revenue as the seismic data is acquired and/or processed on a proportionate basis as work is performed. The Company uses quantifiable measures of progress consistent with its multi-client seismic surveys.
Acquisition Systems and Other Seismic Equipment - For sales of seismic data acquisition systems and other seismic equipment, the Company recognizes revenue when control of the goods has transferred to the customer. Transfer of control generally occurs when (i) the Company has a present right to payment; (ii) the customer has legal title to the asset; (iii) the Company has transferred physical possession of the asset; and (iv) the customer has significant rewards of ownership; or (v) the customer has accepted the asset.
Software - Licenses for the Company’s navigation, survey design and quality control software systems provide the customer with a right to use the software. The Company offers usage-based licenses under which it receives a monthly fee based on the number of vessels and licenses used. For these usage-based licenses, revenue is recognized as the performance obligations are performed over the contract term, which is generally two to five years. In addition to usage-based licenses, the Company offers perpetual software licenses as it exists when made available to the customer. Revenue from these licenses is recognized upfront at the point in time when the software is made available to the customer.
These arrangements generally include the Company providing related services, such as training courses, engineering services and annual software maintenance. The Company allocates consideration to each element of the arrangement based upon directly observable or estimated standalone selling prices. Revenue is recognized for these services as control transfers to the customer over time.
Ocean Bottom Integrated Technologies - The Company recognizes revenue as the seismic data is acquired and control transfers to the customer. The Company uses quantifiable measures of progress consistent with its multi-client surveys. In connection with acquisition contracts, the Company may receive revenues for preparation and mobilization of equipment and personnel, capital improvements to vessels, or demobilization activities. The Company defers the revenues earned and incremental costs incurred that are directly related to these activities and recognizes such revenues and costs over the primary contract term of the acquisition project as it transfers the goods and services to the customer. The Company recognizes the costs of relocating vessels without contracts to more promising market sectors as such costs are incurred.
Revenue by Segment and Geographic Area

See Footnote 2 “Segment Information” of Footnotes to Consolidated Financial Statements for revenue by segment and revenue by geographic area for the years ended December 31, 2018, 2017 and 2016. In 2018, the Company had two customers with sales that each exceeded 10% of the consolidated net revenues. Revenues related to these customers are included within the E&P Technology & Services segment. In 2017, the Company had one customer with sales that exceeded 10% of the consolidated net revenues and revenues related to this customer are included within the E&P Technology & Services segment. No single customer represented 10% or more of the consolidated net revenues for 2016.
Unbilled Receivables
Unbilled receivables relate to revenues recognized on multi-client surveys, imaging services and Devices equipment repairs on a proportionate basis, and on licensing of multi-client data libraries for which invoices have not yet been presented to the customer. The following table is a summary of unbilled receivables (in thousands):
 December 31,
 2018 2017
New Venture$38,430
 $33,183
Imaging Services5,075
 4,121
Devices527
 
Total$44,032
 $37,304
The changes in unbilled receivables were as follows (in thousands):
  
Unbilled receivables at December 31, 2017$37,304
 Recognition of unbilled receivables153,611
 Revenues billed to customers(146,883)
Unbilled receivables at December 31, 2018$44,032
Deferred Revenue
Billing practices are governed by the terms of each contract based upon achievement of milestones or pre-agreed schedules. Billing does not necessarily correlate with revenue recognized on a proportionate basis as work is performed and control is transferred to the customer. Deferred revenue represents cash received in excess of revenue not yet recognized as of the reporting period, but will be recognized in future periods. The following table is a summary of deferred revenues (in thousands):
 December 31,
 2018 2017
New Venture$5,797
 $6,548
Imaging Services307
 676
Devices626
 633
Optimization Software & Services980
 1,053
Total$7,710
 $8,910
The changes in deferred revenues were as follows (in thousands):
  
Deferred revenue at December 31, 2017$8,910
Cash collected in excess of revenue recognized25,234
Recognition of deferred revenue (a)
(26,434)
Deferred revenue at December 31, 2018$7,710
(a)    The majority of deferred revenue recognized relates to Company’s Ventures group.
The Company expects to recognize all deferred revenue within the next 12 months.


(4)     Recent Accounting Pronouncements
In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-2, “Leases (Topic 842)” which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The guidance will be effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years with early adoption permitted. The Company will adopt ASU 2016-2 on January 1, 2019 using the modified retrospective method. The Company has completed its evaluation of operating leases related to offices, processing centers, warehouse spaces and, to a lesser extent, certain equipment. The Company expects the adoption of the standard will result in approximately $50 million to $60 million in right-of-use assets and lease obligations on the Consolidated Balance Sheets. The Company expects the Income Statement recognition to appear similar to its current methodology. The Company will elect the practical expedients upon transition which will retain the lease classification for leases and any unamortized initial direct costs that existed prior to the adoption of the standard.
On January 1, 2018, the Company adopted ASC 606 and all the related amendments using the modified retrospective method. The adoption did not have a material impact to the Company’s revenue recognition policy under the previous standard and adoption of the new standard did not result in an adjustment to the Company’s beginning retained earnings balance.
On January 1, 2018, the Company adopted ASU 2016-18, Statement of Cash Flows “Restricted Cash (a consensus of the FASB Emerging Issues Task Force)”, using a retrospective transition method to each period presented. The new standard no longer requires the Company to present transfers between cash and cash equivalents and restricted cash in the statements of cash flows. Adoption of the new standard resulted in a decrease of $0.4 million and $0.6 million in net cash provided by operating activities as previously reported for the years ended December 31, 2017 and 2016, respectively. See the Consolidated Statements of Cash Flows above which includes a reconciliation of cash and cash equivalents to total cash, cash equivalents, and restricted cash.
In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses: Measurement of Credit Losseson Financial Instruments.” Theguidance will replace the incurred loss impairment methodology under current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates The guidance is effective for public companies for interim and annual periods beginning after December 15, 2019, with early adoption permitted for interim and annual periods beginning after December 15, 2018. The Company is in the initial stages of evaluating the impact of this standard on the Consolidated Financial Statements.
(5)    Long-term Debt and Lease Obligations
The following is a summary of long-term debt and lease obligation (in thousands):
  December 31,
  2018 2017
Senior secured second-priority lien notes (maturing December 15, 2021)
 $120,569
 $120,569
Senior secured third-priority lien notes (redeemed March 26, 2018)
 
 28,497
Revolving credit facility (amended August 16, 2018, maturing August 16, 2023) (a)
 
 10,000
Equipment capital leases 2,938
 279
Other debt 1,159
 1,382
Costs associated with issuances of debt (2,925) (3,983)
Total 121,741
 156,744
Current portion of long-term debt and lease obligations (2,228) (40,024)
Non-current portion of long-term debt and lease obligations $119,513
 $116,720
(a)The maturity of the revolving credit facility will accelerate to December 15, 2021 if the Company is unable to repay or extend the maturity of the Second Lien Notes.
Revolving Credit Facility
On August 16, 2018, ION and its material U.S. subsidiaries; GX Technology Corporation, ION Exploration Products (U.S.A) Inc. and I/O Marine Systems Inc. (the “Material U.S. Subsidiaries”), along with GX Geoscience Corporation, S. de R.L. de C.V., a limited liability company (Sociedad de Responsibilidad Limitada de Capital Variable) organized under the laws of Mexico, and a subsidiary of the Company (the “Mexican Subsidiary”), (the Material U.S. Subsidiaries and the Mexican Subsidiary are collectively, the “Subsidiary Borrowers”, together with ION Geophysical Corporation are the “Borrowers”), the financial institutions party thereto, as lenders, and PNC Bank, National Association (“PNC”), as agent for the lenders, entered into that certain Third Amendment and Joinder to Revolving Credit and Security Agreement (the “Third Amendment”), amending the Revolving Credit and Security Agreement, dated as of August 22, 2014 (as previously amended by the First

Amendment to Revolving Credit and Security Agreement, dated as of August 4, 2015 and the Second Amendment to Revolving Credit and Security Agreement, dated as of April 28, 2016, the “Credit Agreement”). The Credit Agreement, as amended by the First Amendment, the Second Amendment and the Third Amendment is herein called, the “Credit Facility”).
The Credit Facility is available to provide for the Borrowers’ general corporate needs, including working capital requirements, capital expenditures, surety deposits and acquisition financing.
The Third Amendment amends the Credit Agreement to, among other things:
extend the maturity date of the Credit Facility by approximately four years (from August 22, 2019 to August 16, 2023), subject to the retirement or extension of the maturity date of the Second Lien Notes, as defined below, which mature on December 15, 2021;
increase the maximum revolver amount by $10 million (from $40 million to $50 million);
increase the borrowing base percentage of the net orderly liquidation value as it relates to the multi-client data library (not to exceed $28.5 million, up from the previous maximum of $15 million for the multi-client data library component);
include the eligible billed receivables of the Mexican Subsidiary up to a maximum of $5 million in the borrowing base calculation and joins the Mexican Subsidiary as a borrower thereunder (with a maximum exposure of $5 million) and require the equity and assets of the Mexican Subsidiary to be pledged to secure obligations under the Credit Facility;
modify the interest rate such that the maximum interest rate remains consistent with the fixed interest rate prior to the Third Amendment (that is, 3.00% per annum for domestic rate loans and 4.00% per annum for LIBOR rate loans), but now lowers the range down to a minimum interest rate of 2.00% for domestic rate loans and 3.00% for LIBOR rate loans based on a leverage ratio for the preceding four-quarter period;
decrease the minimum excess borrowing availability threshold which (if the Borrowers have minimum excess borrowing availability below any such threshold) triggers the agent’s right to exercise dominion over cash and deposit accounts; and
modify the trigger required to test for compliance with the fixed charge coverage ratio, which is further described below.
The maximum amount under the Credit Facility is the lesser of $50.0 million or a monthly borrowing base. The borrowing base under the Credit Facility will increase or decrease monthly using a formula based on certain eligible receivables, eligible inventory and other amounts, including a percentage of the net orderly liquidation value of the Borrowers’ multi-client data library.  As of December 31, 2018, the borrowing base under the Credit Facility was $41.9 million and there was no outstanding indebtedness under the Credit Facility.
The obligations of Borrowers under the Credit Facility are secured by a first-priority security interest in 100% of the stock of the Subsidiary Borrowers and 65% of the equity interest in ION International Holdings L.P. and by substantially all other assets of the Borrowers. However, the first-priority security interest in the other assets of the Mexican Subsidiary is limited to a maximum exposure of $5.0 million.
The Credit Facility contains covenants that, among other things, limit or prohibit the Borrowers, subject to certain exceptions and qualifications, from incurring additional indebtedness in excess of permitted indebtedness (including capital lease obligations), repurchasing equity, paying dividends or distributions, granting or incurring additional liens on the Borrowers’ properties, pledging shares of the Borrowers’ subsidiaries, entering into certain merger transactions, entering into transactions with the Company’s affiliates, making certain sales or other dispositions of the Borrowers’ assets, making certain investments, acquiring other businesses and entering into sale-leaseback transactions with respect to the Borrowers’ property.
The Credit Facility, requires that ION and the Subsidiary Borrowers maintain a minimum fixed charge coverage ratio of 1.1 to 1.0 as of the end of each fiscal quarter during the existence of a covenant testing trigger event. The fixed charge coverage ratio is defined as the ratio of (i) ION’s EBITDA, minus unfunded capital expenditures made during the relevant period, minus distributions (including tax distributions) and dividends made during the relevant period, minus cash taxes paid during the relevant period, to (ii) certain debt payments made during the relevant period. A covenant testing trigger event occurs upon (a) the occurrence and continuance of an event of default under the Credit Facility or (b) by a two-step process based on (i) a minimum excess borrowing availability threshold (excess borrowing availability less than $6.25 million for five consecutive business days or $5.0 million on any given business day, and (ii) the Borrowers’ unencumbered cash maintained in a PNC deposit account is less that the Borrowers’ then outstanding obligations. Prior to the Third Amendment, the test covenant compliance was tied to a total liquidity measure (liquidity less than $7.5 million for five consecutive days or $6.5 million on any given day).
As of December 31, 2018, the Company was in compliance with all of the covenants under the Credit Facility.

The Credit Facility, as amended, contains customary event of default provisions (including a “change of control” event affecting ION), the occurrence of which could lead to an acceleration of the Company’s obligations under the Credit Facility.
Senior Secured Notes
As of December 31, 2018, ION Geophysical Corporation’s 9.125% Senior Secured Second Priority Notes due December 2021 (the “Second Lien Notes”) had an outstanding principal amount of $120.6 million. Prior to its early redemption, ION Geophysical Corporation’s 8.125% Senior Secured Second-Priority Notes due May 2018 (the “Third Lien Notes”) had an aggregate principal amount of $28.5 million. In March 2018, ION Geophysical Corporation obtained consent from a majority of the Second Lien Notes holders and from PNC to redeem, in full, the Third Lien Notes prior to their stated maturity. On March 26, 2018, ION Geophysical Corporation redeemed the Third Lien Notes by paying the then outstanding principal amount, plus all accrued and unpaid interest through the redemption date.
The Second Lien Notes remain outstanding and are senior secured second-priority obligations guaranteed by the Material U.S. Subsidiaries and the Mexican Subsidiary (each as defined above and herein below, with the reference to the Second Lien Notes, the “Guarantors”). Interest on the Second Lien Notes accrues at the rate of 9.125% per annum and is payable semiannually in arrears on June 15 and December 15 of each year during their term, except that the interest payment otherwise payable on June 15, 2021 will be payable on December 15, 2021.
The April 2016 indenture governing the Second Lien Notes contains certain covenants that, among other things, limits or prohibits ION Geophysical Corporation’s ability and the ability of its restricted subsidiaries to take certain actions or permit certain conditions to exist during the term of the Second Lien Notes, including among other things, incurring additional indebtedness, creating liens, paying dividends and making other distributions in respect of ION Geophysical Corporation’s capital stock, redeeming ION Geophysical Corporation’s capital stock, making investments or certain other restricted payments, selling certain kinds of assets, entering into transactions with affiliates, and effecting mergers or consolidations. These and other restrictive covenants contained in the Second Lien Notes Indenture are subject to certain exceptions and qualifications. All of ION Geophysical Corporation’s subsidiaries are currently restricted subsidiaries.
As of December 31, 2018, the Company was in compliance with the covenants with respect to the Second Lien Notes.
On or after December 15, 2019, the Company may on one or more occasions redeem all or a part of the Second Lien Notes at the redemption prices set forth below, plus accrued and unpaid interest and special interest, if any, on the Second Lien Notes redeemed during the twelve-month period beginning on December 15th of the years indicated below:
        
Date Percentage
2019 105.500%
2020 103.500%
2021 and thereafter 100.000%
Equipment Capital Leases
The Company has entered into capital leases that are due in installments for the purpose of financing the purchase of computer equipment through 2019.2021. Interest accrues under these leases at rates of upfrom 4.3% to 4.3%8.7% per annum, and the leases are collateralized by liens on the computer equipment. The assets are amortized over the lesser of their related lease terms or their estimated productive lives and such charges are reflected within depreciation expense.

A summary of future principal obligations under long-term debt and equipment capital lease obligations follows (in thousands):
Years Ended December 31, Short-Term and Long-Term Debt Capital Lease Obligations Other Financing Total
2018 $38,497
 $250
 $1,382
 $40,129
Years Ending December 31, Short-Term and Long-Term Debt Capital Lease Obligations Other Financing Total
2019 
 29
 
 29
 $
 $1,069
 1,159
 $2,228
2020 
 
 
 
 
 1,135
 
 1,135
2021 
 
 
 
 120,569
 734
 
 121,303
2022 120,569
 
 
 120,569
Total $159,066
 $279
 $1,382
 $160,727
 $120,569
 $2,938
 $1,159
 $124,666

(4)
(6)    Net Income (Loss) per Common Share
Basic net income (loss) per common share is computed by dividing net income (loss) applicable to common shares by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is determined based on the assumption that dilutive restricted stock and restricted stock unit awards have vested and outstanding dilutive stock options have been exercised and the aggregate proceeds were used to reacquire common stock using the average price of such common stock for the period. The total number of shares issuable under anti-dilutive options at December 31, 20172018, 20162017 and 20152016 were 785,890, 890,341 847,635 and 560,797847,635, respectively. All outstanding stock options for the twelve months ended December 31, 2018, 2017 2016 and 20152016 were anti-dilutive.
(5)(7)    Income Taxes
The sources of income (loss) before income taxes are as follows (in thousands):
Years Ended December 31,Years Ended December 31,
2017 2016 20152018 2017 2016
Domestic$(12,487) $(41,246) $21,065
$(59,212) $(12,487) $(41,246)
Foreign(16,866) (19,060) (42,175)(8,468) (16,866) (19,060)
Total$(29,353) $(60,306) $(21,110)$(67,680) $(29,353) $(60,306)
Components of income taxes are as follows (in thousands):
 Years Ended December 31,
 2017 2016 2015
Current:     
Federal$(166) $
 $(4,715)
State and local116
 28
 41
Foreign5,494
 5,574
 1,274
Deferred:     
Federal(1,263) 
 2,726
Foreign(4,157) (1,181) 4,718
Total income tax expense$24
 $4,421
 $4,044

 Years Ended December 31,
 2018 2017 2016
Current:     
Federal$
 $(166) $
State and local65
 116
 28
Foreign8,905
 5,494
 5,574
Deferred:     
Federal(346) (1,263) 
Foreign(5,906) (4,157) (1,181)
Total income tax expense$2,718
 $24
 $4,421
A reconciliation of the expected income tax expense on income (loss) before income taxes using the statutory federal income tax rate of 21% for 2018 and 35% for 2017, and 2016 and 2015 to income tax expense follows (in thousands):
Years Ended December 31,Years Ended December 31,
2017 2016 20152018 2017 2016
Expected income tax expense at 35%$(10,274) $(21,107) $(7,389)
Expected income tax expense at 21% for 2018 and 35% for 2017 and 2016$(14,213) $(10,274) $(21,107)
Foreign tax rate differential(2,914) 5,932
 1,769
74
 (2,914) 5,932
Foreign tax differences(5,610) (4,828) 4,104
4,703
 (5,610) (4,828)
Global intangible low tax income inclusion3,443
 
 
State and local taxes116
 28
 41
65
 116
 28
Nondeductible expenses4,308
 (259) 578
1,604
 4,308
 (259)
Change in U.S. tax rate77,410
 
 

 77,410
 
Expired Capital Loss1,114
 1,321
 15,950
Expired capital loss
 1,114
 1,321
Valuation allowance:          
Valuation allowance on expiring capital losses(1,114) (1,321) (15,950)
 (1,114) (1,321)
Valuation allowance on operations(63,012) 24,655
 4,941
7,042
 (63,012) 24,655
Total income tax expense$24
 $4,421
 $4,044
$2,718
 $24
 $4,421

As a result of passage of the Tax Cut and Jobs Act (the “Act”) onin December 22, 2017, the Company’s U.S. deferred tax assets, liabilities, and associated valuation allowance as of December 31, 2018 and 2017 have been re-measured at the new U.S. federal tax rate of 21%.
The tax effects of the cumulative temporary differences resulting in the net deferred income tax asset (liability) are as follows (in thousands):
December 31,December 31,
2017 20162018 2017
Non-current deferred:   
Deferred income tax assets:      
Accrued expenses$1,976
 $2,994
$1,126
 $1,976
Allowance Accounts2,960
 4,861
Allowance accounts6,415
 2,960
Net operating loss carryforward87,705
 98,896
96,854
 87,705
Capital loss carryforward
 1,114
Equity method investment35,292
 58,820
35,292
 35,292
Original issue discount9,624
 17,924
8,073
 9,624
Interest limitation5,845
 
Basis in identified intangibles9,408
 15,286
4,146
 9,408
Tax credit carryforwards6,929
 7,051
5,345
 6,929
Contingency accrual788
 

 788
Other4,035
 10,755
4,600
 4,035
Total non-current deferred income tax asset158,717
 217,701
Total deferred income tax asset167,696
 158,717
Valuation allowance(153,463) (217,589)(160,505) (153,463)
Net non-current deferred income tax asset5,254
 112
Net deferred income tax asset7,191
 5,254
Deferred income tax liabilities:      
Other
 (1,240)
Unbilled receivables(3,501) (1,908)
 (3,501)
Basis in property, plant and equipment
 (531)
Total net non-current deferred income tax asset (liability)$1,753
 $(3,567)
Total deferred income tax asset, net$7,191
 $1,753
During 2013, the Company established a valuation allowance on the substantial majority of U.S. net deferred tax assets due to the significant charges taken during the year and the related inability to rely on projections of future income. As of December 31, 2017,2018, the Company has a valuation allowance on substantially all net U.S. deferred tax assets. The valuation allowance was released in 2017 with respect to refundable U.S. alternative minimum tax (“AMT”) credits that will be realized as a result of provisions in the Act. TheA valuation allowance was calculated in accordance with the provisions of ASC 740-10, “Accounting for Income Taxes,” which requires that a valuation allowance beis established or maintained when it is “more likely than not” that all or a portion of deferred tax assets will not be realized. The Company will continue to record a valuation allowance for the substantial majority of its deferred tax assets until there is sufficient evidence to warrant reversal.

At December 31, 2017,2018, the Company had U.S. net operating loss carryforwards of approximately $238.0$274.4 million, expiring in 2034 and beyond, and net operating loss carryforwards outside of the U.S. of approximately $134.7$153.1 million, the majority of which expireexpires beyond 2025.
As of December 31, 2017,2018, the Company has approximately $0.4 million of unrecognized tax benefits and does not expect to recognize any significant increases in unrecognized tax benefits during the next twelve-month period. Interest and penalties, if any, related to unrecognized tax benefits are recorded in income tax expense. During 2018, 2017 2016 and 2015,2016, the aggregate changes in the Company’s total gross amount of unrecognized tax benefits are summarized as follows (in thousands):
Years Ended December 31,Years Ended December 31,
2017 2016��20152018 2017 2016
Beginning balance$1,299
 $1,250
 $1,957
$447
 $1,299
 $1,250
Increases in unrecognized tax benefits – current year positions59
 49
 75

 59
 49
Decreases in unrecognized tax benefits – prior year position(911) 
 (782)
 (911) 
Ending balance$447
 $1,299
 $1,250
$447
 $447
 $1,299
The Company’s U.S. federal tax returns for 20142015 and subsequent years remain subject to examination by tax authorities. The Company is no longer subject to Internal Revenue Service (“IRS”) examination for periods prior to 2015, although carryforward attributes that were generated prior to 2015 may still be adjusted upon examination by the IRS if they either have been or will be used in a future period. In the Company’s foreign tax jurisdictions, tax returns for 20132012 and subsequent years generally remain open to examination.
As of December 31, 2017,2018, the Company considered the outside book-over-tax basis difference in its foreign subsidiaries to be in the amount of approximately $92.2$85.0 million. United States income taxes have not been provided on this basis difference as it is the Company’s intention to reinvest the undistributed earnings of its foreign subsidiaries to the extent they cannot be remitted to the United States without incurring incremental tax as provided in the Act. Additionally, the Company had no impact in the U.S. with respect to the one-time deemed repatriation of net foreign subsidiary earnings under the Act, as a result of the allocation of foreign subsidiary deficits against positive earnings.

(6)(8)    Legal Matters
WesternGeco
In June 2009,A more thorough treatment of history of this litigation is set forth above in Item 1.A, “Risk Factors”. As noted in that section, in 2014, because a jury found that we infringed four WesternGeco L.L.C. (“WesternGeco”) filed a lawsuit against the Company inpatents, the United States District Court for the Southern District of Texas Houston Division. In the lawsuit, styled WesternGeco L.L.C. v. ION Geophysical Corporation, WesternGeco alleged that the Company had infringed several method and apparatus claims contained in four of its United States patents regarding marine seismic streamer steering devices.
The trial began in July 2012. A verdict was returned by the jury in August 2012, finding that the Company infringed the claims contained in the four patents by supplying its DigiFIN, lateral streamer control units and the related software from the United States and awarded WesternGeco the sum of $105.9 million in damages, consisting of $12.5 million in reasonable royalty and $93.4 million in lost profits.
In June 2013, the presiding judge entered a Memorandum and Order, denying the Company’s post-verdict motions that challenged the jury’s infringement findings and the damages amount. In the Memorandum and Order, the judge also stated that WesternGeco was entitled to be awarded supplemental damages for the additional DigiFIN units that were supplied from the United States before and after trial that were not included in the jury verdict due to the timing of the trial. In October 2013, the judge entered another Memorandum and Order, ruling on the number of DigiFIN units that were subject to supplemental damages and also ruling that the supplemental damages applicable to the additional units were to be calculated by adding together the jury’s previous reasonable royalty and lost profits damages awards per unit, resulting in supplemental damages of $73.1 million.
In April 2014, the judge entered another Order, ruling that lost profits should not have been included in the calculation of supplemental damages in the October 2013 Memorandum and Order and reducing the supplemental damages award in the case from $73.1 million to $9.4 million. In the Order, the judge also further reduced the damages awarded in the case by $3.0 million to reflect a settlement and license that WesternGeco entered into with a customer of the Company that had purchased and used DigiFIN units that were also included in the damage amounts awarded against the Company.
In May 2014, the judge signed and(the “District Court”) entered a Final Judgment against us in the amount of $123.8 million. The Final Judgment also included an injunction that enjoins the Company, its agents$123.8 million ($12.5 million in reasonable royalties, $93.4 million in lost profits, $10.9 million in pre-judgment interest on lost profits, and anyone acting$9.4 million in concert with it, from supplying in or from the United States the DigiFIN product or any parts unique to the DigiFIN product, or any instrumentality no more than colorably different from any of these products or parts, for combination outside of the United States. The Company has conducted its business in compliance with the District Court’s orders in the case, and the Company has reorganized its operations such that it no longer supplies the DigiFIN product or any parts unique to the DigiFIN product in or from the United States.supplemental damages).

The Company and WesternGeco each appealed the Final Judgment toIn 2015, the United States Court of Appeals for the Federal Circuit in Washington, D.C. (the “Court of Appeals”). On July 2, 2015, the Court of Appeals reversed, in part, the Final Judgment of the District Court, holding the District Court erred by including lost profits in the Final Judgment. Lost profits were $93.4 million and prejudgment interest onthat the lost profits, was approximately $10.9 million ofwhich were attributable to foreign seismic surveys, were not available to WesternGeco under the $123.8 million Final Judgment. Pre-judgment interest on the lost profits portion will be treated in the same way as the lost profits. Post-judgment interest will likewise be treated in the same fashion. On July 29, 2015, WesternGeco filed a petition for rehearing en banc before the Court of Appeals. On October 30, 2015, the Court of Appeals denied WesternGeco’s petition for rehearing en banc.
As previously disclosed, wePatent Act. The Company had previously takenrecorded a loss contingency accrual of $123.8 million. because of the District Court’s ruling. As a result of the reversal by the Court of Appeals, as of June 30, 2015, wethe Company reduced ourthe loss contingency accrual to $22.0 million.
On February 26, 2016, WesternGeco filed a petition for writappealed the Court of certiorari byAppeals’ decision to the Supreme Court. The Company filed its response on April 27, 2016. Subsequently, onCourt, as to both lost profits and “enhanced” damages (damages which are available for willful infringement, and which neither the District Court nor the Trial Court awarded). On June 20, 2016, the Supreme Court vacated the Court of Appeals’ ruling, although it did not address the lost profits question at that time. Rather, in light of the changes in case law regarding the standard of proof for willfulness in the Halo and Stryker cases,patent infringement, the Supreme Court indicated thatremanded the case should be remanded to the Court of Appeals for a determination of whether or not the willfulness determination byenhanced damages were appropriate.
On November 14, 2016, the District Court was appropriate.
ordered our sureties to pay principal and interest on the royalty damages previously awarded. On October 14,November 25, 2016, the Court of Appeals issued a mandate returningCompany paid WesternGeco the case$20.8 million due pursuant to the District Court for consideration of whether or not additional damages for willfulness we appropriate. order, and it reduced its loss contingency accrual to zero.
On March 14, 2017, the District Court held a hearing on whether or notimpose additional damages for willfulness would be payable.willfulness. The Judge found that ION’sthe Company’s infringement was willful, based on his perception that ION did not adequately investigate the scope of the patent, and ION’s conduct during trial. However, in his ruling at the hearing, he limitedawarded enhanced damages toof $5.0 million because it was a “close case,” there was no evidence of copying, and ION was simply acting as a competitorto WesternGeco (WesternGeco had sought $43.6 million in a capitalist marketplace.such damages.) The District Court also ordered the appeal bond to be released and discharged. The Court’s findings and ruling were memorialized in an order issued on May 16, 2017. On June 30, 2017, WesternGeco and the Company jointlyand WesternGeco agreed that neither partyof them would appeal the District Court's award of $5.0 million in enhanced damages. The parties also agreed thatUpon assessment of the enhanced damages, the Company accrued $5.0 million in the first quarter of 2017. As the Company have paid the $5.0 million would be paid over, the courseaccrual has been adjusted, and as of 12 months with $1.25 million being paid in two installments of $0.625 million in 2017 andDecember 31, 2018, the remaining $3.75 million being paid in three quarterly payments of $1.25 million beginning January 1, 2018. This agreementloss contingency accrual was memorialized by the court in an order issued on July 26, 2017.zero.
WesternGeco filed a second petition for writ of certiorari in the U.S. Supreme Court on February 17, 2017, appealing the lost profits issue again. The Company filed its response to WesternGeco’s second attempt to appeal to the Supreme Court the lost profits issue, raising both the substantive matters the Company addressed by opposing WesternGeco’s first petition, and also raising a procedural argument that WesternGeco cannot raise the same issue for a second time in a second petition for certiorari. On May 30, 2017, the Supreme Court called for the views of the U.S. Solicitor General regardingGeneral’s views on whether or not the Supreme Court ought to grant certiorari. The Company and WesternGeco each met with the Solicitor General’s office in late July, 2017.hear WesternGeco’s appeal. On December 6, 2017, the Solicitor General filed its brief, and took the position that the Supreme Court ought to grant certiorari.hear the appeal and that foreign lost profits ought to be available. On January 12, 2018, the Supreme Court granted certiorari asagreed to whetherhear the appeal. The specific issue before the Supreme Court of Appeals erred in holding thatwas whether lost profits arising from use of prohibited combinations occurring outside of the United States are categorically unavailable in cases where patent infringement is proven under 35 U.S.C. § 271(f)(2) (the specific statute under which the Company was ultimatelywere held to have infringed WesternGeco’s patents, and upon which the District Court and the Federal CircuitCourt of Appeals relied in entering their final rulings).
The Supreme Court heard oral arguments on April 16, 2018. The Company will argue to the Supreme Courtargued that the decision of the Court of AppealsAppeals’ decision that eliminated lost profits ought to be upheld. We anticipate oral arguments will take place in Aprilaffirmed. WesternGeco and the Solicitor General argued that the Court of Appeals’ decision that eliminated lost profits ought to be reversed.
On June 22, 2018, and that the Supreme Court will issue a decision byreversed the endjudgment of June of 2018.
At the Court of Appeals, held that the Company presented multiple arguments as to why the District Court’s award of lost profits was improper. The lost profits damages awardedto WesternGeco by the District Court were based on the usewas a permissible application of Section 284 of the Company’s products by our customers outsidePatent Act, and remanded the case back to the Court of Appeals for further proceedings consistent with its (the Supreme Court’s) opinion. On July 24, 2018, the Supreme Court issued the judgment that returned the case to the Court of Appeals.
On July 27, 2018, the Court of Appeals vacated its September 21, 2016 judgment with respect to damages, and ordered WesternGeco and the Company to submit supplemental briefing on what relief is appropriate in light of the United States. Supreme Court’s decision. The Company and WesternGeco each submitted briefing in accordance with the Court of Appeals’ order (the last brief was filed on September 7, 2018).
The Company argued atin its brief to the Court of Appeals that as a matter of law, WesternGeco cannot recoup lost profits for the overseas use of our products. The Company also argued that, underwere not available to WesternGeco because the jury instructions given in our case, WesternGeco would needrequired them to havefind that the Company had been aWesternGeco’s direct competitor of the Company’s in the survey markets to recoupwhere WesternGeco had lost profits, and that the jury was required to findcould not have found so. Additionally, we argued that WesternGeco and ION were direct competitors. Because the Court of Appeals ruled in our favor on the first argument, and overturned the award of lost profits and reasonable royalties ought to be vacated and retried on that basis,separate grounds due to the Courtoutcome of Appeals did not rule on our “direct competitor” argument. Ifan Inter Partes Review (“IPR”) filed with the Supreme Court overturnsPatent Trial and Appeal Board (“PTAB”) of the Patent and Trademark Office.

Until the Court of Appeals’ January 11, 2019 decision issued (which is described below), the IPR was an administrative proceeding that lost profits cannot be awarded to WesternGeco becausewas separate from the subsequent use2009 lawsuit. By means of the apparatus was overseas, the case will be remanded back to the Court of Appeals, at which timeIPR, the Company will present our second argument (that lost profits should not be awarded to WesternGeco because they were not our direct competitor).
Other proceedings may have an impact on WesternGeco’s ability to recover lost profits damages even if WesternGeco prevails in the Supreme Court, and even if the Company does not prevail on the “direct competitor” argument in the Court of Appeals. The Company was a party tojoined a challenge to the validity of several of WesternGeco’s patent claims by means of an Inter Partes Review (“IPR”) with the Patent Trial and Appeal Board (“PTAB”).that another company had filed. While the above-described2009 lawsuit was pending on appeal, the PTAB invalidated four of the six patent claims that formed the basis for the jury verdict inlawsuit judgment against the lawsuit.

Company. WesternGeco appealed that decisionthe PTAB’s invalidation of its patents to the Court of Appeals, which heard our and WesternGeco’s arguments on January 23, 2018. IfAppeals. On May 7, 2018, the Court of Appeals affirmsaffirmed the PTAB’s invalidation of the patents, that may provide a separate ground for reducing or vacating any lost-profits award in the lawsuit. We expectand on July 16, 2018, the Court of Appeals denied WesternGeco’s petition for a rehearing. On December 13, 2018, WesternGeco filed a petition with the Supreme Court, arguing that the Court of Appeals ought to rulehave overturned the decision of the PTAB. (As of February 7, 2019, the Supreme Court has not indicated whether it will, or will not, hear WesternGeco’s appeal.)
In the same brief to the Court of Appeals in which the Company made its “direct competitor” argument, the Company argued that the Court of Appeals’ affirmation of the PTAB’s decision precluded WesternGeco’s damages claims, and that the Court of Appeals should order a new trial as to the royalty damages already paid by the Company. The Company also argued that if the Court of Appeals did not find its “direct competitor” argument persuasive, the Court should nonetheless vacate the District Court’s award of royalty damages and lost profits damages and order a new trial as to both royalty damages and lost profits.
In its briefs to the Court of Appeals, WesternGeco argued that the only remaining issue was whether lost profits were unavailable to WesternGeco due to the Company’s “direct competitor” argument, and argued that the invalidation of four of its six patent claims by the PTAB (which was affirmed by the Court of Appeals) should have no effect on lost profits or on the PTAB issue lateroyalty award already paid by the Company. WesternGeco also argued that lost profits should be available notwithstanding the Company’s “direct competitor” argument.
Oral arguments took place on November 16, 2018, and on January 11, 2019, the Court of Appeals issued its ruling. In its ruling, the Court of Appeals refused to disturb the award of reasonable royalties to WesternGeco (which the Company paid in first quarter2016), and rejected the Company’s “direct competitor” argument, but vacated the District Court’s award of 2018 or inlost profits damages and remanded the second quartercase back to the District Court to determine whether to hold a new trial as to lost profits. The Court of 2018.Appeals also ruled that its affirmance of the PTAB’s decision eliminated four of the five patent claims that could have supported the award of lost profits, leaving only one remaining patent claim that could support an award of lost profits.
The Company may not ultimately prevail in anyCourt of the appeals processes noted above and we could be required to pay some or all ofAppeals further held that the lost profits that were awarded by the District Court. Our assessment that we do not have a loss contingency may change in the future due to developments at the Supreme Court, Court of Appeals, or District Court, and other events, such as changes in applicable law, and such reassessment could lead to the determination that a loss contingency is probable, which could have a material effect on our business, financial condition and results of operations. The Company’s assessments disclosed in this Annual Report on Form 10-K or elsewhere are based on currently available information and involve elements of judgment and significant uncertainties. Actual losses may equal oraward can be considerably less than the lost profits awarded by the District Court. The Company does not anticipate that any losses from the date hereof would exceed the lost profits awardedreinstated by the District Court (exceptif the existing trial record establishes that the jury must have found that the technology covered by the one remaining patent claim was essential for performing the potential impositionsurveys upon which lost profits were based. To make such a finding, the District Court must conclude that the present trial record establishes that there was no dispute that the technology covered by the one remaining patent claim, independent of prethe technology of the now-invalid claims, was required to perform the surveys. The Court of Appeals ruling further provides that if, but only if, the District Court concludes that WesternGeco established at trial, with undisputed evidence, that the remaining claim covers technology that was necessary to perform the surveys, then the District Court may deny a new trial and post-judgment interest).reinstate lost profits.
Other
The Company has been named in various other lawsuits or threatened actions that are incidental to its ordinary business. Litigation is inherently unpredictable. Any claims against the Company, whether meritorious or not, could be time-consuming, cause the Company to incur costs and expenses, require significant amounts of management time and result in the diversion of significant operational resources. The results of these lawsuits and actions cannot be predicted with certainty. Management currently believes that the ultimate resolution of these matters will not have a material adverse impact on the financial condition, results of operations or liquidity of the Company.
(7)(9)    Other Income (Expense)
A summary of other income (expense) follows (in thousands):
 Years Ended December 31,
 2017 2016 2015
Reduction of (accrual for) loss contingency related to legal proceedings (Footnote 6)$(5,000) $1,168
 $101,978
Recovery of INOVA bad debts844
 3,983
 
Loss on bond exchange
 (2,182) 
Other income211
 (1,619) (3,703)
Total other income (loss)$(3,945) $1,350
 $98,275
 Years Ended December 31,
 2018 2017 2016
(Accrual for) reduction of loss contingency related to legal proceedings (Footnote 8)$
 $(5,000) $1,168
Recovery of INOVA bad debts
 844
 3,983
Loss on bond exchange
 
 (2,182)
Other income (expense)(436) 211
 (1,619)
Total other income (expense), net$(436) $(3,945) $1,350


(8)(10)    Details of Selected Balance Sheet Accounts
Accounts Receivable
 A summary of accounts receivable follows (in thousands):
December 31,
 2017 2016
Accounts receivable, principally trade$20,050
 $22,214
Less allowance for doubtful accounts(572) (1,444)
Accounts receivable, net$19,478
 $20,770

 A summary of accounts receivable follows (in thousands):
December 31,
 2018 2017
Accounts receivable, principally trade$26,558
 $20,050
Less allowance for doubtful accounts(430) (572)
Accounts receivable, net$26,128
 $19,478
Inventories
A summary of inventories follows (in thousands):December 31,December 31,
2017 20162018 2017
Raw materials and purchased subassemblies$20,448
 $21,454
$20,011
 $20,448
Work-in-process1,146
 2,255
1,032
 1,146
Finished goods7,953
 6,581
8,111
 7,953
Reserve for excess and obsolete inventories(15,039) (15,049)
Total$14,508
 $15,241
Less reserve for excess and obsolete inventories(15,024) (15,039)
Inventories, net$14,130
 $14,508
Property, Plant, Equipment and Seismic Rental Equipment
A summary of property, plant, equipment and seismic rental equipment follows (in thousands):
December 31,December 31,
2017 20162018 2017
Buildings$15,822
 $17,424
$15,707
 $15,822
Machinery and equipment145,654
 157,618
132,135
 145,654
Seismic rental equipment1,677
 1,557
1,423
 1,677
Furniture and fixtures3,869
 3,905
3,859
 3,869
Other28,965
 30,049
30,104
 28,965
Total195,987
 210,553
183,228
 195,987
Less accumulated depreciation(143,834) (143,065)(133,634) (143,834)
Less impairment of long-lived assets(36,553) 
Property, plant, equipment and seismic rental equipment, net$52,153
 $67,488
$13,041
 $52,153
Total depreciation expense, including amortization of assets recorded under capital leases, for 20172018, 20162017 and 20152016 was $15.2$7.6 million, $20.3$15.2 million and $24.620.3 million, respectively.
Intangible Assets
 A summary of intangible assets, net, follows (in thousands):December 31, 2017
 
Gross
Amount
 
Accumulated
Amortization
 Net
Customer relationships$34,400
 $(32,734) $1,666
Total$34,400
 $(32,734) $1,666
 December 31, 2016
 
Gross
Amount
 
Accumulated
Amortization
 Net
Customer relationships$36,934
 $(33,831) $3,103
Total$36,934
 $(33,831) $3,103
Total amortization expense for intangible assets for 2017, 2016 and 2015 was $1.4 million, $1.7 million and $1.9 million, respectively. A summary of the estimated amortization expense for the next three years follows (in thousands):
Years Ended December 31, 
2018$1,169
2019$497

Accrued Expenses
A summary of accrued expenses follows (in thousands):December 31,December 31,
2017 20162018 2017
Compensation, including compensation-related taxes and commissions$19,809
 $14,935
$14,502
 $19,809
Accrued multi-client data library acquisition costs5,104
 567
3,746
 5,104
Income tax payable1,868
 1,306
7,577
 1,868
Accrual for legal proceedings (Footnote 6)3,750
 
Accrual for loss contingency related to legal proceedings (Footnote 8)
 3,750
Other8,166
 9,432
5,586
 8,166
Total$38,697
 $26,240
$31,411
 $38,697

Other Long-term Liabilities
A summary of other long-term liabilities follows (in thousands):December 31,December 31,
2017 20162018 2017
Deferred lease liabilities12,811
 13,955
11,465
 12,811
Facility restructuring accrual
 1,765
Deferred income tax liability
 3,679
Other1,115
 1,128
429
 1,115
Total$13,926
 $20,527
$11,894
 $13,926
(9)(11)    Goodwill
On December 31, 2017,2018, the Company completed the annual reviews of the carrying value of goodwill in its E&P Technology & Services and Optimization Software & Services reporting units and noted no impairments. The qualitative assessment concluded it was more likely than not that the fair values of the Company’s E&P Technology & Services, and Optimization Software & Services reporting units exceeded their carrying values.
The following is a summary of the changes in the carrying amount of goodwill for the years ended December 31, 20172018 and 20162017 (in thousands):
E&P Technology & Services Optimization Software & Services TotalE&P Technology & Services Optimization Software & Services Total
Balance at January 1, 2016$2,943
 $23,331
 $26,274
Impact of foreign currency translation adjustments
 (4,066) (4,066)
Balance at December 31, 20162,943
 19,265
 22,208
Balance at January 1, 2017$2,943
 $19,265
 $22,208
Impact of foreign currency translation adjustments
 1,881
 1,881

 1,881
 1,881
Balance at December 31, 2017$2,943
 $21,146
 $24,089
2,943
 21,146
 24,089
Impact of foreign currency translation adjustments
 (1,174) (1,174)
Balance at December 31, 2018$2,943
 $19,972
 $22,915
(10)(12)    Stockholders' Equity and Stock-based Compensation
Public Equity Offering
On February 21, 2018, the Company completed the public equity offering (the “Offering”) of its 1,820,000 shares of common stock at a public offering price of $27.50 per share, and warrants to purchase an additional 1,820,000 shares of the Company’s common stock pursuant to the Registration Statement on Form S-3 (No. 33-213769) filed with the Securities and Exchange Commission under the Securities Act of 1933 and declared effective on December 2, 2016. The net proceeds from this Offering were $47.0 million, including transaction expenses. A portion of the net proceeds were used to retire the Company’s $28.5 million Third Lien Notes in March 2018. The warrants have an exercise price of $33.60 per share, are immediately exercisable and expire on March 21, 2019.
Stock Option Plans
The Company has adopted stock option plans for eligible employees, directors and consultants, which provide for the granting of options to purchase shares of common stock. The options under these plans generally vest in equal annual installments over a four-year period and have a term of ten years. These options are typically granted at pre-established quarterly grant dates with an exercise price per share equal to or greater than the current market price and, upon exercise, are issued from the Company’s unissued common shares. In August 2006, the Compensation Committee (“Committee”) of the Board of Directors (“Board”) of the Company approved fixed pre-established quarterly grant dates for all future grants of options.
At-The-Market Equity Offering Program

On December 22, 2016 the Company announced that it had filed a prospectus supplement under which it may sell up to $20.0 million of its common stock through an "at-the-market" equity offering program (the "ATM Program"). The Company intended to use the net proceeds from sales under the ATM Program for general corporate purposes. The timing of any sales depended on a variety of factors to be determined by the Company. Effective May 2, 2017, the Company terminated and canceled the ATM Program.  No shares were sold pursuant to the ATM Program and the Company has no further obligations thereunder.
Stock Repurchase Program
On November 4, 2015, the Company’s board of directors approved a stock repurchase program authorizing a Company stock repurchase, from time to time from November 10, 2015 through November 10, 2017, up to $25 million in shares of the Company’s outstanding common stock. The stock repurchase program was implemented through open market repurchases or privately negotiated transactions, at management’s discretion. The actual timing, number and value of shares repurchased under the program was determined by management at its discretion and depended on a number of factors including the market price of the shares of our common stock and general market and economic conditions, applicable legal requirements and compliance with the terms of the Company’s outstanding indebtedness. The repurchase program did not obligate the Company to acquire any particular amount of common stock and could be modified or suspended at any time and could be terminated prior to completion. As of December 31, 2016, the Company was authorized to repurchase up to $25 million through November 10, 2017 and had repurchased $3 million or 451,792 shares of its common stock under the repurchase program at an average price per share of $6.41. The program expired November 10, 2017.
Transactions under the stock option plans are summarized as follows:
 
Option Price
per Share
 Outstanding Vested 
Available
for Grant
January 1, 2015$37.05-245.85
 599,069
 358,390
 183,468
Granted34.20
 53,328
 
 (53,328)
Vested
 
 79,779
 
Cancelled/forfeited37.05-231.45
 (91,600) (53,864) 12,358
Restricted stock granted out of option plans
 
 
 (45,652)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 157
December 31, 201534.20-245.85
 560,797
 384,305
 97,003
Increase in shares authorized
 
 
 1,150,940
Granted3.10
 415,000
 
 (415,000)
Vested
 
 67,480
 
Cancelled/forfeited3.10-245.85
 (128,162) (103,432) 18,895
Restricted stock granted out of option plans
 
 
 (259,300)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 7,182
December 31, 20163.10-245.85
 847,635
 348,353
 599,720
Granted13.15
 156,000
 
 (156,000)
Vested
 
 149,537
 
Exercised3.10
 (15,000) (15,000) 
Cancelled/forfeited3.10-245.85
 (98,294) (47,612) 82,118
Restricted stock granted out of option plans
 
 
 (59,500)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 22,065
December 31, 2017$3.10-$245.85
 890,341
 435,278
 488,403
        

 
Option Price
per Share
 Outstanding Vested 
Available
for Grant
January 1, 2016$34.20 - $245.85
 560,797
 384,305
 97,003
Increase in shares authorized
 
 
 1,150,940
Granted3.10
 415,000
 
 (415,000)
Vested
 
 67,480
 
Cancelled/forfeited3.10 - 245.85
 (128,162) (103,432) 18,895
Restricted stock granted out of option plans
 
 
 (259,300)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 7,182
December 31, 2016$3.10 - $245.85
 847,635
 348,353
 599,720
Granted13.15
 156,000
 
 (156,000)
Vested
 
 149,537
 
Exercised3.10
 (15,000) (15,000) 
Cancelled/forfeited3.10 - 245.85
 (98,294) (47,612) 82,118
Restricted stock granted out of option plans
 
 
 (59,500)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 22,065
December 31, 20173.10 - 245.85
 890,341
 435,278
 488,403
Increase in shares authorized
 
 
 1,200,000
Granted24.50
 10,000
 
 (10,000)
Vested
 
 153,944
 
Exercised3.10
 (70,086) (70,086) 
Cancelled/forfeited3.10 - 245.85
 (44,365) (44,231) 2,568
Restricted stock granted out of option plans
 
 
 (996,775)
Restricted stock forfeited or cancelled for employee minimum income taxes and returned to the plans
 
 
 48,524
December 31, 2018$3.10 - $151.35
 785,890
 474,905
 732,720
Stock options outstanding at December 31, 20172018 are summarized as follows:

Option Price per ShareOutstanding Weighted Average Exercise Price of Outstanding Options Weighted Average Remaining Contract Life Vested Weighted Average Exercise Price of Vested OptionsOutstanding Weighted Average Exercise Price of Outstanding Options Weighted Average Remaining Contract Life Vested Weighted Average Exercise Price of Vested Options
$3.10 - $57.90641,030
 $15.17
 7.1 years 202,312
 $29.89
558,997
 $15.64
 7.2 years 248,012
 $24.32
$61.05 - $71.8576,963
 $62.14
 5.8 years 60,618
 $62.43
75,231
 $62.17
 4.7 years 75,231
 $62.17
$81.60 - $99.60115,742
 $88.79
 4.4 years 115,742
 $88.79
108,610
 $88.94
 3.6 years 108,610
 $88.94
$106.05 - $245.8556,606
 $131.16
 2.7 years 56,606
 $131.16
$106.05 - $151.3543,052
 $108.84
 2.3 years 43,052
 $108.84
Totals890,341
 $36.17
 6.4 years 435,278
 $63.25
785,890
 $35.33
 5.4 years 474,905
 $52.76

Additional information related to the Company’s stock options follows:
Number of Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life Aggregate Intrinsic Value (000’s)Number of Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life Aggregate Intrinsic Value (000’s)
Total outstanding at January 1, 2017847,635
 $46.21
   6.1 years $1,175
Total outstanding at January 1, 2018890,341
 $36.17
   6.4 years $6,774
Options granted156,000
 $13.15
 $8.10
  10,000
 $24.50
 $15.23
  
Options exercised(15,000) $3.10
    (70,086) $3.10
    
Options cancelled(50,682) $7.32
    (134) $61.05
    
Options forfeited(47,612) $180.52
    (44,231) $100.85
    
Total outstanding at December 31, 2017890,341
 $36.17
   6.4 years $6,774
Options exercisable and vested at December 31, 2017435,278
 $63.25
   5.4 years $1,436
Total outstanding at December 31, 2018785,890
 $35.33
   5.4 years $572
Options exercisable and vested at December 31, 2018474,905
 $52.76
   5 years $213
The total intrinsic value of options exercised during 2018, 2017 and 2016 and 2015 was $1.4 million, less than $0.1 million $0.1 million and less than $0.1 million, respectively. Cash received from option exercises under all share-based payment arrangements for 2018 and 2017 was $0.2 million and less than $0.1 million, respectively, and during 2016, and 2015 there was no cash received. The weighted average grant date fair value for stock option awards granted during 2018, 2017 and 2016 and 2015 was $15.23, $8.10 $2.04 and $16.652.04 per share, respectively.
The Company calculated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model. The following assumptions were used for each respective period:
 Years Ended December 31,
 2018 2017 2016
Risk-free interest rates2.78% 2.14% 1.3%
Expected lives (in years)5.0 5.0 5.5
Expected dividend yield—% —% —%
Expected volatility73.67% 74.41% 78.76%
The computation of expected volatility during 2018, 2017 and 2016 was based on an equally weighted combination of historical volatility and market-based implied volatility. Historical volatility was calculated from historical data for a period of time approximately equal to the expected term of the option award, starting from the date of grant. Market-based implied volatility was derived from traded options on the Company’s common stock having a term of six months. The Company’s computation of expected life in 2018, 2017 and 2016 was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The risk-free interest rate assumption is based upon the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option.
Restricted Stock and Restricted Stock Unit Plans
On November 30, 2018, the Company’s stockholders approved certain amendments to the Company’s Second Amended and Restated 2013 Long-term Incentive Plan (the “2013 LTIP”) including increasing the total number of shares of common stock available for issuance under the 2013 LTIP by 1.2 million shares, for a total of approximately 1.7 million shares, eliminating the restriction on the number of shares in the 2013 LTIP that can be issued as full value awards and certain other technical updates and clarifications related to Section 162(m) of the internal revenue code, as amended.
The Company has issued restricted stock and restricted stock units under the Company’s 2013 Long-Term Incentive PlanLTIP, as amended and other applicable plans. Restricted stock units are awards that obligate the Company to issue a specific number of shares of common stock in the future if continued service vesting requirements are met. Non-forfeitable ownership of the common stock will vest over a period as determined by the Company in its sole discretion, generally in equal annual installments over a three-year period. Shares of restricted stock awarded may not be sold, assigned, transferred, pledged or otherwise encumbered by the grantee during the vesting period.

On December 1, 2018, the Company issued 900,002 restricted stocks to selected employees with a grant date fair value $7.19, $6.51 and $5.89 for each of the tranches. The vesting of these restricted stocks is achieved through both a market condition and a service condition. The market condition is achieved, in part or in full, in the event that during the three-year period beginning on the date of grant the 20-day trailing volume-weighted average price of a share of common stock reaches or exceeds (i) $17.50 for the first 1/3 of the awards, (ii) $22.50 for the second 1/3 of the awards, and (iii) $27.50 for the final 1/3 of the awards. The service condition restricts the ability of the holders to exercise awards until certain service milestones have been reached such that (i) no more than 1/3 of the awards may be exercised, if vested, on and after the first anniversary of the date of grant, (ii) no more than 2/3 of the awards may be exercised, if vested, on and after the second anniversary of the date of grant and (iii) all of the awards may be exercised, if vested, on and after the third anniversary of the date of grant.
The status of the Company’s restricted stock and restricted stock unit awards for 20172018 follows:
 
Number of 
Shares/Units
Total nonvested at January 1, 20172018285,308201,702
Granted59,500996,775
Vested(115,577151,852)
Forfeited(27,5292,500)
Total nonvested at December 31, 20172018201,7021,044,125
At December 31, 20172018, 2017 and 2016, the intrinsic value of restricted stock and restricted stock unit awards was approximately $5.4 million, $4.0 million.million and $1.7 million, respectively. The weighted average grant date fair value for restricted stock and restricted stock unit awards granted during 20172018, 20162017 and 20152016 was $10.60, $11.36 $3.81 and $34.20$3.81 per share, respectively. The total fair value of shares vested during 2018, 2017 and 2016 and 2015 was $3.8 million, $0.6 million $0.2 million and $0.6 million, respectively.

Employee Stock Purchase Plan
Effective February, 2016, the Company suspended its Employee Stock Purchase Plan (“ESPP”) that had been in place since June 2010. The ESPP allowed all eligible employees to authorize payroll deductions at a rate of 1% to 10% of base compensation (or a fixed amount per pay period) for the purchase of the Company’s common stock. Each participant was limited to purchase no more than 33 shares per offering period or 66 shares annually. Additionally, no participant could purchase shares in any calendar year that exceeded $10,000 in fair market value based on the fair market value of the stock on the offering commencement date. The purchase price of the common stock was the lesser of 85% of the closing price on the first day of the applicable offering period (or most recently preceding trading day) or 85% of the closing price on the last day of the offering period (or most recently preceding trading day). Each offering period was six months and commenced on February 1 and August 1 of each year. The ESPP was considered a compensatory plan under ASC 718, and the Company recorded compensation expense of approximately $0.1 million and $0.2 million during 2016 and 2015, respectively. The expense represents the estimated fair value of the look-back purchase option. The fair value was determined using the Black-Scholes option pricing model and was recognized over the purchase period.
Stock Appreciation Rights Plan
The Company has adopted a stock appreciation rights plan which provides for the award of stock appreciation rights (“SARs”) to directors and selected key employees and consultants. The awards under this plan are subject to the terms and conditions set forth in agreements between the Company and the holders. The exercise price per SAR is not to be less than one hundred percent of the fair market value of a share of common stock on the date of grant of the SAR. The term of each SAR shall not exceed ten years from the grant date. Upon exercise of a SAR, the holder shall receive a cash payment in an amount equal to the spread specified in the SAR agreement for which the SAR is being exercised. In no event will any shares of common stock be issued, transferred or otherwise distributed under the plan.
On December 1, 2018, the Company issued 960,009 SARs awards to selected employees with an exercise price of $8.85 (“2018 SARs”). None of these 2018 SARs were awarded to non-employee directors. The 2018 SARs have the same service and market vesting conditions as the restricted stocks issued on December 1, 2018, as described above. The maximum value of each 2018 SARs is capped at $18.65 (the spread between the share price cap of $27.50 and the $8.85 per award price).
The 2018 SARs are considered liability awards and as such, these amounts are accrued in the liability section of the consolidated balance sheets. The Company calculated the fair value of each 2018 SARs award as of December 31, 2018 using a Monte Carlo simulation model. The following assumptions were used:
Risk-free interest rates3.0%
Expected lives (in years)5.31
Expected dividend yield%
Expected volatility82.9%

On March 1, 2016, the Company issued 1,210,000 Stock Appreciation Rights (“SARs”)SARs awards to 15 selected key employees with an exercise price of $3.10.$3.10 (“2016 SARs”). None of these 2016 SARs were awarded to non-employee directors. The vesting of these 2016 SARs is achieved through both a market condition and a service condition. The market condition is achieved, in part or in full, in the event that during the four-year period beginning on the date of grant the 20-day trailing volume-weighted average price of a share of common stock is (i) greater than 120% of the exercise price for the first 1/3 of the awards, (ii) greater than 125% of the exercise price for the second 1/3 of the awards and (iii) greater than 130% of the exercise price for the final 1/3 of the awards. The service condition restricts the ability of the holders to exercise awards until certain service milestones have been reached such that (i) no more than 1/3 of the awards may be exercised, if vested, on and after the first anniversary of the date of grant, (ii) no more than 2/3 of the awards may be exercised, if vested, on and after the second anniversary of the date of grant and (iii) all of the awards may be exercised, if vested, on and after the third anniversary of the date of grant. The maximum value of each 2016 SARs is capped at $19.40 (the spread between the share price cap of $22.50 and the $3.10 per award price).
On December 13, 2017, the Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of the Company authorized and approved the acceleration of the vesting date to December 13, 2017 for the second tranche of the Company’s outstanding 2016 SARs. The second tranche of the 2016 SARs awards was originally scheduled to vest on March 1, 2018. The vesting of the second tranche of the 2016 SARs awards was accelerated to facilitate the exercise by the 2016 SARs participants, if they so choose, of a larger portion of the 2016 SARs awards prior to year-end, as such an exercise would minimize the potential cash flow impact of any such exercise in the first quarter of 2018, would mitigate the ongoing mark to market accounting requirements for cash-settled 2016 SARs, and would afford the 2016 SARs participants liquidity to invest in common stock of the Company to further align their interests with those of the Company’s stockholders. Participants exercised 663,330 SARs awards at a $9.95 gain per share.
The 2016 SARs are considered liability awards and as such, these amounts are accrued in the liability section of the consolidated balance sheets. The Company calculated the fair value of each 2016 SARs award on the date of grant and remeasured at each reporting period using a Monte Carlo simulation model. However, as of December 31, 2018, the fair value of the 2016 SARs awards were derived using the intrinsic value method since the final tranche of the 2016 SARs awards vest on March 1, 2019, less than twelve months from the balance sheet date.
On March 1, 2015, the Company issued 207,207 SARs awards to 16 selected key employees with an exercise price of $34.20 (“2015 SARs”). None of these 2015 SARs were awarded to non-employee directors. The 2015 SARs awards number and exercise price have been retroactively adjusted to reflect the one-for-fifteen reverse stock split completed on February 4, 2016. The vesting of these 2015 SARs is achieved through both a market condition and a service condition. The market condition is achieved, in part or in full, in the event that during the four-year period beginning on the date of grant the 20-day trailing volume-weighted average price of a share of common stock is (i) greater than 120% of the exercise price for the first 1/3 of the awards, (ii) greater than 125% of the exercise price for the second 1/3 of the awards and (iii) greater than 130% of the exercise price for the final 1/3 of the awards. The exercise condition restricts the ability of the holders to exercise awards until certain service milestones have been reached such that (i) no more than 1/3 of the awards may be exercised, if vested, on and after the first anniversary of the date of grant, (ii) no more than 2/3 of the awards may be exercised, if vested, on and after the second anniversary of the date of grant and (iii) all of the awards may be exercised, if vested, on and after the third anniversary of the date of grant.
On December 13, 2017, the Compensation Committee (the “Committee”) of the Board of Directors (the “Board”) of the Company authorized and approved the acceleration of the vesting date to December 13, 2017 for the second tranche of the Company’s outstanding SARs, which were issued on March 1, 2016. The second tranche of the SARs awards was originally scheduled to vest on March 1, 2018. The vesting of the second tranche of the SARs awards was accelerated to facilitate the exercise by the SARs participants, if they so choose, of a larger portion of the SARs awards prior to year-end, as such an exercise would minimize the potential cash flow impact of any such exercise in the first quarter of 2018, would mitigate the ongoing mark to market accounting requirements for cash-settled SARs, and would afford the SARs participants liquidity to invest in common stock of the Company to further align their interests with those of the Company’s stockholders. Participants exercised 663,330 SARs awards at a $9.95 gain per share.
Pursuant to ASC 718, the2015 SARs are considered liability awards and as such, these amounts are accrued in the liability section of the consolidated balance sheet.sheets. The Company calculated the fair value of each SAR2015 SARs award ason the date of December 31, 2017grant and remeasured at each reporting period using a Monte Carlo simulation model. The following assumptions were used:
December 31, 2017
Risk-free interest rates2.36%
Expected lives (in years)1.25
Expected dividend yield—%
Expected volatility77.8%

On March 1, 2015,As of December 31, 2018, the Company issued 207,207 SAR awards to 16 selected key employees with an exercise price of $34.20. None of these SARs were awarded to non-employee directors. The SAR awards number and exercise price have been retroactively adjusted to reflect the one-for-fifteen reverse stock split completed on February 4, 2016. The vesting of these SARs is achieved through both a market condition and a service condition. Thehad not been met for the 2015 SARs. If the market condition is achieved, in part or in full, innot met by March 1, 2019, the event that during the four-year period beginning on the date of grant the 20-day trailing volume-weighted average price of a share of common stock is (i) greater than 120% of the exercise price for the first 1/3 of the awards, (ii) greater than 125% of the exercise price for the second 1/3 of the awards and (iii) greater than 130% of the exercise price for the final 1/3 of the awards. The exercise condition restricts the ability of the holders to exercise awards until certain service milestones have been reached such that (i) no more than 1/3 of the awards may be exercised, if vested, on and after the first anniversary of the date of grant, (ii) no more than 2/3 of the awards may be exercised, if vested, on and after the second anniversary of the date of grant and (iii) all of the awards may be exercised, if vested, on and after the third anniversary of the date of grant.
Pursuant to ASC 718, “Compensation – Stock Compensation,” the2015 SARs are considered liability awards and as such, these amounts are accrued in the liability section of the balance sheet. The Company calculated the fair value of each SAR award on the date of grant using a Monte Carlo simulation model. The following assumptions were used:
December 31, 2015
Risk-free interest rates2.19%
Expected lives (in years)3.3
Expected dividend yield—%
Expected volatility69.38%
Additionally, as of December 31, 2017, the Company had 9,333 SAR awards outstanding to one individual with an exercise price of $45.00.will expire.
The Company recorded $6.6$0.8 million of share-based compensation expense during 20172018, $0.5$6.6 million during 20162017 and less than $0.1$0.5 million in 20152016, related to employee SARs.
Additional information related to the Company's SARs follows:
 Number of Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life Aggregate Intrinsic Value (000’s)
Total outstanding at January 1, 20159,333
 $45.00
   2.9 years $
SARs granted207,199
 $34.20
 $9.94
    
Total outstanding at December 31, 2015216,532
 $34.67
      
SARs granted1,210,000
 $3.10
 $17.55
    
SARs cancelled(10,399) $34.20
      
Total outstanding at December 31, 20161,416,133
 $7.70
      
SARs exercised(713,330) $3.10
      
SARs cancelled(136,939) $7.70
      
Total outstanding at December 31, 2017565,864
 $13.49
   7.2 years $6,327
SARs exercisable and vested at December 31, 201744,332
 $11.92
   7.2 years $583
Valuation Assumptions
The Company calculated the fair value of each stock option on the date of grant using the Black-Scholes option pricing model. The following assumptions were used for each respective period:
 Years Ended December 31,
 2017 2016 2015
Risk-free interest rates2.14% 1.3% 1.38%
Expected lives (in years)5.0 5.5 4.5
Expected dividend yield—% —% —%
Expected volatility74.41% 78.76% 59.32%
 Number of Shares Weighted Average Exercise Price Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Life Aggregate Intrinsic Value (000’s)
Total outstanding at January 1, 2016216,532
 $34.67
   
 

SARs granted1,210,000
 $3.10
 $17.55
    
SARs cancelled(10,399) $34.20
      
Total outstanding at December 31, 20161,416,133
 $7.70
      
SARs exercised(713,330) $3.10
      
SARs cancelled(136,939) $7.70
      
Total outstanding at December 31, 2017565,864
 $13.49
      
SARs granted960,009
 $8.85
 8.85
    
SARs exercised(34,999) $3.10
      
SARs forfeited(9,333) $45.00
      
Total outstanding at December 31, 20181,481,541
 $10.53
   8.1 years $718
SARs exercisable and vested at December 31, 2018
 $
      

The computation of expected volatility during 2017, 2016 and 2015 was based on an equally weighted combination of historical volatility and market-based implied volatility. Historical volatility was calculated from historical data for a period of time approximately equal to the expected term of the option award, starting from the date of grant. Market-based implied volatility was derived from traded options on the Company’s common stock having a term of six months. The Company’s computation of expected life in 2017, 2016 and 2015 was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior. The risk-free interest rate assumption is based upon the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option.
Stock-based Compensation Expense
The following tables summarizes stock-based compensation expense for the years ended December 31, 20172018, 20162017 and 20152016 as follows (in thousands):
Years Ended December 31,Years Ended December 31,
2017 2016 20152018 2017 2016
Stock-based compensation expense$2,552
 $3,267
 $5,486
$3,337
 $2,552
 $3,267
Tax benefit related thereto(862) (1,168) (1,826)(698) (862) (1,168)
Stock-based compensation expense, net of tax$1,690
 $2,099
 $3,660
$2,639
 $1,690
 $2,099
Years Ended December 31,Years Ended December 31,
2017 2016 20152018 2017 2016
Stock appreciation rights expense$6,611
 $547
 $(54)$822
 $6,611
 547
Tax benefit related thereto(2,314) (191) 19
(173) (2,314) (191)
Stock appreciation rights expense, net of tax$4,297
 $356
 $(35)$649
 $4,297
 $356
Equity Investment Program
To encourage the Company’s executive officers and other key employees to purchase common stock of the Company and further align their interests with those of the Company’s stockholders, the Board authorized and approved an equity investment program (the “Program”) pursuant to which certain of the executive officers and other key employees of the Company are permitted, but not obligated, to purchase unregistered shares of common stock of the Company directly from the Company at market prices. In connection with any such purchases, the Committee authorized and approved, on December 13, 2017, a grant by the Company to such purchasing executive officers and key employees of a certain number of shares of restricted stock. On December 13, 2017, the Committee also authorized and approved to grant to certain executive officers and key employees a certain number of shares of restricted stock in connection with certain purchases of shares of the Company’s common stock in the open market.
Specifically, for each five (5) shares directly purchased from the Company or in the open market during a defined period (to expire no later than December 31, 2017), the Company will issue one (1) share of restricted stock, subject to certain limitations as to the total number of restricted shares to be issued by the Company. Provided that an executive officer or key employee remains employed with the Company until March 1, 2018, the restricted stock will be granted as of March 1, 2018, will vest in full on the date that is 90 days after the grant date and will be subject to the other terms and conditions of the Company’s form of restricted stock agreement and the Company’s 2013 Long-Term Incentive Plan.LTIP. The Company sold, in a private placement under Section 4(a)(2) of the Securities Act of 1933, as amended on December 14, 2017, 120,567 shares of Company common stock at $13.05 per share (the closing price of the Company’s common stock on the NYSE on such date) and executive officers and

other key employees purchased 219,346 shares in the open market. On May 30, 2018, 43,865 shares of restricted stock vested at $24.75 per share.

(11)(13)    Supplemental Cash Flow Information and Non-Cash Activity
Supplemental disclosure of cash flow information follows (in thousands):
Years Ended December 31, Years Ended December 31, 
2017 2016 2015 2018 2017 2016 
Cash paid during the period for:            
Interest$14,181
 $15,691
 $15,441
 $5,731
 $14,181
 $15,691
 
Income taxes7,030
 4,474
 8,163
 3,260
 7,030
 4,474
 
Non-cash items from investing and financing activities:            
Purchase of computer equipment financed through capital leases
 
 1,178
 3,297
 
 
 
Leasehold improvement paid by landlord
 955
 
 
 
 955
 
Issuance of stock in bond exchange
 10,741
 
 
 
 10,741
 
Transfer of inventory to property, plant and equipment
 17,662
(a)15,936
(b)
 
 17,662
(a)
Investment in multi-client data library financed through trade payables9,059
 
 8,939
 4,956
 9,059
 
 
(a) 
This transfer of $17.7 million of inventory to property, plant, equipment and seismic rental equipment in December 2016, relates to ocean bottom seismic equipment manufactured by the Company to be deployed in the acquisition of ocean bottom seismic data.
(b)
This transfer of inventory to property, plant, equipment and seismic rental equipment relates to ocean bottom seismic equipment manufactured by the Company to be deployed in the acquisition of ocean bottom seismic data. During the twelve months ended December 31, 2015, the Company purchased approximately $19.2 million of property, plant, equipment and seismic rental equipment, including approximately $15.3 million related to the manufacture of ocean bottom seismic equipment that will be used by the Ocean Bottom Seismic Services segment.
(12)(14)    Operating Leases
Lessee. The Company leases certain equipment, offices and warehouse space under non-cancelable operating leases. Rental expense was $11.4$10.1 million,$11.4 million and $11.3 million and $11.8 millionfor 20172018, 20162017 and 20152016, respectively.
A summary of future rental commitments over the next five years under non-cancelable operating leases follows (in thousands):
Years Ending December 31,  
2018$10,334
20199,812
$13,248
20209,480
12,857
20219,435
11,075
20229,251
10,821
20239,205
Total$48,312
$57,206
(13)(15)    Fair Value of Financial Instruments
Authoritative guidance on fair value measurements defines fair value, establishes a framework for measuring fair value and stipulates the related disclosure requirements. The Company follows a three-level hierarchy, prioritizing and defining the types of inputs used to measure fair value.
Due to their highly liquid nature, the amount of the Company’s other financial instruments, including cash and cash equivalents, restricted cash, accounts and unbilled receivables, short term investments, accounts payable and accrued multi-client data library royalties, represent their approximate fair value.
The carrying amounts of the Company’s long-term debt as of December 31, 2018 and 2017 and 2016 were $160.7$124.7 million and $163.9160.7 million, respectively, compared to its fair values of $158.2$120.7 million and $114.8158.2 million as of December 31, 20172018 and 2016,2017, respectively. The fair value of the long-term debt was calculated using Level 1 inputs, including an active market price.
Fair value measurements are applied with respect to non-financial assets and liabilities measured on a non-recurring basis, which would consist of measurements primarily of goodwill, intangibles assets, multi-client data library and property, plant and equipment and seismic rental equipment.
        

(14)(16)    Benefit Plans
The Company has a 401(k) retirement savings plan, which covers substantially all employees. Employees may voluntarily contribute up to 60% of their compensation, as defined, to the plan. Effective June 1, 2000, the Company adopted a company matching contribution to the 401(k) plan. The Company matched the employee contribution at a rate of 50% of the first 6% of compensation contributed to the plan. Company contributions to the plans were $0.8$0.9 million, $0.8 million and $1.40.8 million, during 20172018, 20162017 and 20152016, respectively.
(15)(17)    Selected Quarterly Information — (Unaudited)
A summary of selected quarterly information follows (in thousands, except per share amounts):
Three Months EndedThree Months Ended
Year Ended December 31, 2017March 31 June 30 September 30 December 31
March 31, 2018 June 30, 2018 September 30, 2018 December 31, 2018
Service revenues$23,828
 $34,454
 $52,615
 $48,513
$25,086
 $15,752
 $37,105
 $61,095
Product revenues8,728
 11,547
 8,480
 9,389
8,422
 8,991
 10,095
 13,499
Total net revenues32,556
 46,001
 61,095
 57,902
33,508
 24,743
 47,200
 74,594
Gross profit6,101
 15,618
 30,109
 23,811
Income (loss) from operations(13,912) (3,572) 9,936
 (1,151)
Gross profit (loss)6,853
 (1,517) 16,475
 37,809
Loss from operations(12,640) (22,519) (2,452) (16,661)
Interest expense, net(4,464) (4,241) (3,959) (4,045)(3,836) (2,911) (3,022) (3,203)
Other income (expense)(5,068) 192
 722
 209
Other income (expense), net(791) 84
 91
 180
Income tax expense (benefit)(418) 2,402
 1,686
 (3,646)1,072
 154
 2,079
 (587)
Net (income) loss attributable to noncontrolling interests(316) (418) (78) (53)
Net income (loss) applicable to ION$(23,342) $(10,441) $4,935
 $(1,394)
Net income (loss) per share:       
Net income attributable to noncontrolling interests(87) (366) (74) (246)
Net loss applicable to ION$(18,426) $(25,866) $(7,536) $(19,343)
Net loss per share:       
Basic$(1.98) $(0.88) $0.42
 $(0.12)$(1.44) $(1.86) $(0.54) $(1.38)
Diluted$(1.98) $(0.88) $0.41
 $(0.12)$(1.44) $(1.86) $(0.54) $(1.38)
Three Months EndedThree Months Ended
Year Ended December 31, 2016March 31 June 30 September 30 December 31
March 31, 2017 June 30, 2017 September 30, 2017 December 31, 2017
Service revenues$13,156
 $25,430
 $65,914
 $26,140
$23,828
 $34,454
 $52,615
 $48,513
Product revenues9,509
 10,722
 12,708
 9,229
8,728
 11,547
 8,480
 9,389
Total net revenues22,665
 36,152
 78,622
 35,369
32,556
 46,001
 61,095
 57,902
Gross profit (loss)(8,930) 4,853
 31,765
 8,344
Gross profit6,101
 15,618
 30,109
 23,811
Income (loss) from operations(30,129) (16,588) 11,864
 (8,318)(13,912) (3,572) 9,936
 (1,151)
Interest expense, net(4,734) (4,702) (4,607) (4,442)(4,464) (4,241) (3,959) (4,045)
Other income (expense)120
 (1,717) (2,027) 4,974
Other income (expense), net(5,068) 192
 722
 209
Income tax expense (benefit)293
 2,256
 3,316
 (1,444)(418) 2,402
 1,686
 (3,646)
Net (income) loss attributable to noncontrolling interests22
 (79) (215) (149)
Net income attributable to noncontrolling interests(316) (418) (78) (53)
Net income (loss) applicable to ION$(35,014) $(25,342) $1,699
 $(6,491)$(23,342) $(10,441) $4,935
 $(1,394)
Net income (loss) per share:              
Basic$(3.30) $(2.22) $0.14
 $(0.55)$(1.98) $(0.88) $0.42
 $(0.12)
Diluted$(3.30) $(2.22) $0.14
 $(0.55)$(1.98) $(0.88) $0.41
 $(0.12)
The sum of the quarterly per share information may not tie to per share information in the Consolidated Statements of Operations due to rounding.
(16)(18)    Certain Relationships and Related Party Transactions
For 2018, 2017 2016 and 2015,2016, the Company recorded revenues from BGP of $4.9 million, $4.4 million $3.6 million and $6.3$3.6 million, respectively. Receivables due from BGP were $0.6$1.6 million and $0.4$0.6 million at December 31, 20172018 and 2016,2017, respectively. BGP owned approximately 13.0%10.6% of the Company’s outstanding common stock as of December 31, 2017.2018.

Mr. James M. Lapeyre, Jr. is the Chairman of the Board on ION’s board of directors and a significant equity owner of Laitram, L.L.C. (Laitram), and he has served as president of Laitram and its predecessors since 1989. Laitram is a privately-owned, New Orleans-based manufacturer of food processing equipment and modular conveyor belts. Mr. Lapeyre and Laitram together owned approximately 10.2%8.8% of the Company’s outstanding common stock as of December 31, 20172018.

The Company acquired DigiCourse, Inc., the Company’s marine positioning products business, from Laitram in 1998. In connection with that acquisition, the Company entered into a Continued Services Agreement with Laitram under which Laitram agreed to provide the Company certain bookkeeping, software, manufacturing and maintenance services. Manufacturing services consist primarily of machining of parts for the Company’s marine positioning systems. The term of this agreement expired in September 2001 but the Company continues to operate under its terms. In addition, from time to time, when the Company has requested, the legal staff of Laitram has advised the Company on certain intellectual property matters with regard to the Company’s marine positioning systems. During 2018 and 2017, the Company paid Laitram and its affiliates $0.4 million and $0.2 million, respectively, which consisted of manufacturing services and reimbursement of costs. During 2016, and 2015 the Company paid less than $0.1 million in each year for reimbursement for costs related to providing administrative and other back-office support services in connection with the Company’s Louisiana marine operations. In addition, the Company is currently subleasing approximately 4,100 square feet of office space to Laitram. In the opinion of the Company’s management, the terms of these services are fair and reasonable and as favorable to the Company as those that could have been obtained from unrelated third parties at the time of their performance.
In July 2013, the Company agreed to lend up to $10.0 million to INOVA Geophysical, and received a promissory note issued by INOVA Geophysical to the order of the Company, which was scheduled to mature on September 30, 2013. INOVA Geophysical has repaid a total of $6.0 million, of which $4.0 million remained outstanding at December 31, 2017. INOVA has advised the Company that it is not currently able to repay the outstanding amount. In December 2014, the Company wrote down the book value of this receivable to zero.
(17)    Cost Reduction Initiatives and Other Charges
2016 Cost Reduction Initiatives and Other Charges
In April 2016, the Company implemented additional cost saving initiatives by reducing its current workforce by approximately 12%. Additional reductions were needed to further streamline the organization and bring it in line with the Company’s current revenue stream, while maintaining the necessary core capabilities to continue our operations and strategic initiatives. In addition, the Company incurred losses in association with the exchange of a portion of its bonds during the second quarter 2016. During the twelve months ended December 31, 2016, the Company recognized the following pre-tax charges (in thousands):
 
Severance charges(a)
 
Loss on bond exchange(b)
 Total
Cost of goods sold$1,077
 $
 $1,077
Operating expenses932
 
 932
Other expense
 2,182
 2,182
Consolidated total$2,009
 $2,182
 $4,191
(a)
Represents severance charges related to the second quarter 2016 restructurings.
(b)
Represents a loss on exchange of bonds during the second quarter 2016.
2015 Cost Reduction Initiatives
During 2015, the Company implemented additional savings initiatives by (i) centralizing the Company’s global data processing capabilities to two core geographical hubs in the U.S. and the U.K., (ii) reducing the Company’s marine repair infrastructure to two locations in the U.S. and U.A.E., (iii) making further reductions in personnel across all of the Company’s segments that, combined with reductions starting in December 2014 and reduced the Company’s full-time employee base by approximately 50%. During 2015, the Company recognized the following pre-tax charges and credits (in thousands):
 
Severance charges(a)
 
Facility charges(b)
 Total
Cost of goods sold$3,981
 $
 $3,981
Operating expenses1,910
 1,323
 3,233
Other (income) expense
 1,618
 1,618
Income tax benefit(119) (150) (269)
Net income attributable to noncontrolling interest(172) 
 (172)
Consolidated total$5,600
 $2,791
 $8,391
(a)
Represents severance charges related to 2015 restructurings, a portion of which relates to a noncontrolling interest.

(b)
Represents facility charges related to 2015 restructurings.
(18)     Recent Accounting Pronouncements
Revenue Recognition — In May 2014, the FASB and the International Accounting Standards Board (“IASB”) jointly issued new accounting guidance for recognition of revenue. In August 2015, the FASB issued guidance deferring the effective date to years beginning after December 15, 2017, and interim periods within those years. This new guidance replaces virtually all existing U.S. GAAP and IFRS guidance on revenue recognition. The underlying principle is that the entity will recognize revenue to depict the transfer of goods and services to customers at an amount that the entity expects to be entitled to in the exchange of goods and services. The guidance provides a five-step analysis of transactions to determine when and how revenue is recognized. Other major provisions include capitalization of certain contract costs, consideration of time value of money in the transaction price, and allowing estimates of variable consideration to be recognized before contingencies are resolved in certain circumstances. The guidance also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity’s contracts with customers.
In December 2016, the FASB issued amendments to ASC 606, “Revenue from Contracts with Customers”. The amendments allow entities not to make quantitative disclosures about remaining performance obligations in certain cases and require entities that use any of the new or previously existing optional exemptions to expand their qualitative disclosures. It also makes additional technical corrections and improvements to the new revenue standard. The guidance will be effective with the same date and transition requirements as those in ASC 606.
The Company will use the modified retrospective adoption method and has concluded that the adoption of ASC 606 will not have a material impact on its consolidated balance sheets or consolidated statement of operations for any of its reporting segments. The Company adopted this ASU on January 1, 2018, and will disclose additional quantitative and qualitative information regarding revenue and cash flows generated from its contracts with customers.
In February 2016, the FASB issued ASU 2016-2, “Leases (Topic 842)” which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The guidance will be effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years with early adoption permitted. The Company will adopt ASU 2016-2 on January 1, 2019, and estimates this ASU will have a material impact related to its facility operating leases on its consolidated balance sheet.
In November 2016 the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230), Restricted Cash (a consensus of the FASB Emerging Issues Task Force) (ASU 2016-18)”, that will require entities to show changes in the total of cash, cash equivalents, restricted cash and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. When cash, cash equivalents, restricted cash and restricted cash equivalents are presented in more than one-line item on the balance sheet, a reconciliation of the totals in the statement of cash flows to the related captions in the balance sheet is required. The guidance will be effective for annual periods beginning after December 15, 2017 and interim periods within those annual periods. Early adoption is permitted. The Company adopted ASU 2016-18 on January 1, 2018 and has concluded that this ASU will not have a material impact its consolidated balance sheet or consolidated statement of operations.
(19)     Condensed Consolidating Financial Information
The notesSecond Lien Notes were issued by ION Geophysical Corporation, and are guaranteed by the Company’s current material U.S. subsidiaries: GX Technology Corporation, ION Exploration Products (U.S.A.), Inc. and I/O Marine Systems, Inc. (“the Guarantors”), all of which are 100-percent-ownedwholly-owned subsidiaries. The Guarantors have fully and unconditionally guaranteed the payment obligations of ION Geophysical Corporation with respect to these debt securities. In August 2018, as part of the Company entering into the Third Amendment to its Credit Agreement, the Company joined the Mexican Subsidiary as a guarantor with respect to the Second Lien Notes. All periods period presented below have been updated to include the Mexican Subsidiary within The Guarantors column. The following condensed consolidating financial information presents the results of operations, financial position and cash flows for:
ION Geophysical Corporation and the guarantor subsidiariesGuarantors (in each case, reflecting investments in subsidiaries utilizing the equity method of accounting).
All other nonguarantor subsidiaries.subsidiaries of ION Geophysical Corporation that are non-guarantors.
The consolidating adjustments necessary to present ION Geophysical Corporation’s results on a consolidated basis.
This condensed consolidating financial information should be read in conjunction with the accompanying consolidated financial statements and notes.footnotes. For additional information pertaining to the Notes, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part 2 of this Form 10-K.
        

December 31, 2017December 31, 2018
Balance SheetION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total Consolidated
(In thousands)(In thousands)
ASSETS                  
Current assets:                  
Cash and cash equivalents$39,344
 $
 $12,712
 $
 $52,056
$13,782
 $47
 $19,722
 $
 $33,551
Accounts receivable, net50
 9,374
 10,054
 
 19,478
8
 17,349
 8,771
 
 26,128
Unbilled receivables
 16,666
 20,638
 
 37,304

 12,697
 31,335
 
 44,032
Inventories
 8,686
 5,822
 
 14,508

 8,721
 5,409
 
 14,130
Prepaid expenses and other current assets2,427
 769
 4,447
 
 7,643
3,891
 1,325
 2,566
 
 7,782
Total current assets41,821
 35,495
 53,673
 
 130,989
17,681
 40,139
 67,803
 
 125,623
Deferred income tax asset1,264
 
 489
 
 1,753
805
 6,261
 125
 
 7,191
Property, plant, equipment and seismic rental equipment, net511
 7,170
 44,472
 
 52,153
489
 8,922
 3,630
 
 13,041
Multi-client data library, net
 62,438
 26,862
 
 89,300

 70,380
 3,164
 
 73,544
Investment in subsidiaries693,679
 321,934
 
 (1,015,613) 
836,002
 247,359
 
 (1,083,361) 
Goodwill
 
 24,089
 
 24,089

 
 22,915
 
 22,915
Intangible assets, net
 1,666
 
 
 1,666
Intercompany receivables
 132,184
 90,227
 (222,411) 

 305,623
 66,021
 (371,644) 
Other assets686
 145
 288
 
 1,119
1,723
 643
 69
 
 2,435
Total assets$737,961
 $561,032
 $240,100
 $(1,238,024) $301,069
$856,700
 $679,327
 $163,727
 $(1,455,005) $244,749
LIABILITIES AND EQUITY                  
Current liabilities:                  
Current maturities of long-term debt$39,774
 $250
 $
 $
 $40,024
$1,159
 $1,069
 $
 $
 $2,228
Accounts payable1,774
 20,982
 2,195
 
 24,951
2,407
 29,602
 2,904
 
 34,913
Accrued expenses12,284
 15,601
 10,812
 
 38,697
7,011
 10,036
 14,364
 
 31,411
Accrued multi-client data library royalties
 26,824
 211
 
 27,035

 29,040
 216
 
 29,256
Deferred revenue
 3,201
 5,709
 
 8,910

 6,515
 1,195
 
 7,710
Total current liabilities53,832
 66,858
 18,927
 
 139,617
10,577
 76,262
 18,679
 
 105,518
Long-term debt, net of current maturities116,691
 29
 
 
 116,720
117,644
 1,869
 
 
 119,513
Intercompany payables537,417
 
 
 (537,417) 
721,817
 
 
 (721,817) 
Other long-term liabilities454
 6,084
 7,388
 
 13,926
430
 5,698
 5,766
 
 11,894
Total liabilities708,394
 72,971
 26,315
 (537,417) 270,263
850,468
 83,829
 24,445
 (721,817) 236,925
Equity:                  
Common stock120
 290,460
 49,394
 (339,854) 120
140
 290,460
 47,776
 (338,236) 140
Additional paid-in capital903,247
 180,701
 202,290
 (382,991) 903,247
952,626
 180,700
 203,908
 (384,608) 952,626
Accumulated earnings (deficit)(854,921) 248,770
 59,307
 (308,077) (854,921)(926,092) 390,691
 (12,475) (378,216) (926,092)
Accumulated other comprehensive income (loss)(18,879) 4,372
 (19,681) 15,309
 (18,879)(20,442) 4,324
 (22,023) 17,699
 (20,442)
Due from ION Geophysical Corporation
 (236,242) (78,764) 315,006
 

 (270,677) (79,496) 350,173
 
Total stockholders’ equity29,567
 488,061
 212,546
 (700,607) 29,567
6,232
 595,498
 137,690
 (733,188) 6,232
Noncontrolling interests
 
 1,239
 
 1,239

 
 1,592
 
 1,592
Total equity29,567
 488,061
 213,785
 (700,607) 30,806
6,232
 595,498
 139,282
 (733,188) 7,824
Total liabilities and equity$737,961
 $561,032
 $240,100
 $(1,238,024) $301,069
$856,700
 $679,327
 $163,727
 $(1,455,005) $244,749
        

December 31, 2016December 31, 2017
Balance SheetION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total Consolidated
(In thousands)(In thousands)
ASSETS                  
Current assets:                  
Cash and cash equivalents$23,042
 $
 $29,610
 $
 $52,652
$39,344
 $66
 $12,646
 $
 $52,056
Accounts receivable, net
 12,775
 7,995
 
 20,770
50
 12,496
 6,932
 
 19,478
Unbilled receivables
 5,275
 8,140
 
 13,415

 34,484
 2,820
 
 37,304
Inventories
 8,610
 6,631
 
 15,241

 8,686
 5,822
 
 14,508
Prepaid expenses and other current assets3,387
 4,624
 1,548
 
 9,559
2,427
 4,530
 686
 
 7,643
Total current assets26,429
 31,284
 53,924
 
 111,637
41,821
 60,262
 28,906
 
 130,989
Deferred income tax asset1,264
 336
 153
 
 1,753
Property, plant, equipment and seismic rental equipment, net1,745
 12,369
 53,374
 
 67,488
511
 7,170
 44,472
 
 52,153
Multi-client data library, net
 97,369
 8,566
 
 105,935

 81,442
 7,858
 
 89,300
Investment in subsidiaries660,880
 257,732
 
 (918,612) 
693,679
 321,934
 
 (1,015,613) 
Goodwill
 
 22,208
 
 22,208

 
 24,089
 
 24,089
Intangible assets, net
 3,008
 95
 
 3,103
Intercompany receivables
 
 32,174
 (32,174) 

 162,017
 60,394
 (222,411) 
Other assets2,469
 145
 231
 
 2,845
686
 1,811
 288
 
 2,785
Total assets$691,523
 $401,907
 $170,572
 $(950,786) $313,216
$737,961
 $634,972
 $166,160
 $(1,238,024) $301,069
LIABILITIES AND EQUITY                  
Current liabilities:                  
Current maturities of long-term debt$11,281
 $3,166
 $134
 $
 $14,581
$39,774
 $250
 $
 $
 $40,024
Accounts payable2,101
 19,720
 5,068
 
 26,889
1,774
 20,982
 2,195
 
 24,951
Accrued expenses8,579
 10,016
 7,645
 
 26,240
12,284
 16,957
 9,456
 
 38,697
Accrued multi-client data library royalties
 23,663
 
 
 23,663

 26,824
 211
 
 27,035
Deferred revenue
 2,667
 1,042
 
 3,709

 7,231
 1,679
 
 8,910
Total current liabilities21,961
 59,232
 13,889
 
 95,082
53,832
 72,244
 13,541
 
 139,617
Long-term debt, net of current maturities143,930
 279
 
 
 144,209
116,691
 29
 
 
 116,720
Intercompany payables472,276
 10,155
 
 (482,431) 
537,417
 
 
 (537,417) 
Other long-term liabilities467
 12,117
 7,943
 
 20,527
454
 6,084
 7,388
 
 13,926
Total liabilities638,634
 81,783
 21,832
 (482,431) 259,818
708,394
 78,357
 20,929
 (537,417) 270,263
Equity:                  
Common stock118
 290,460
 19,138
 (309,598) 118
120
 290,460
 49,394
 (339,854) 120
Additional paid-in capital899,198
 180,700
 232,590
 (413,290) 899,198
903,247
 180,701
 202,290
 (382,991) 903,247
Accumulated earnings (deficit)(824,679) 216,730
 (3,639) (213,091) (824,679)(854,921) 317,324
 (9,247) (308,077) (854,921)
Accumulated other comprehensive income (loss)(21,748) 4,420
 (21,787) 17,367
 (21,748)(18,879) 4,372
 (19,681) 15,309
 (18,879)
Due from ION Geophysical Corporation
 (372,186) (78,071) 450,257
 

 (236,242) (78,764) 315,006
 
Treasury stock
 

 

 

 
Total stockholders’ equity52,889
 320,124
 148,231
 (468,355) 52,889
29,567
 556,615
 143,992
 (700,607) 29,567
Noncontrolling interests
 
 509
 
 509

 
 1,239
 
 1,239
Total equity52,889
 320,124
 148,740
 (468,355) 53,398
29,567
 556,615
 145,231
 (700,607) 30,806
Total liabilities and equity$691,523
 $401,907
 $170,572
 $(950,786) $313,216
$737,961
 $634,972
 $166,160
 $(1,238,024) $301,069
        

Year Ended December 31, 2017Year Ended December 31, 2018
Income StatementION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total Consolidated
(In thousands)(In thousands)
Total net revenues$
 $77,054
 $120,500
 $
 $197,554
$
 $96,649
 $83,396
 $
 $180,045
Cost of goods sold
 80,427
 41,488
 
 121,915

 85,186
 35,239
 
 120,425
Gross profit (loss)
 (3,373) 79,012
 
 75,639
Gross profit
 11,463
 48,157
 
 59,620
Total operating expenses39,000
 27,950
 17,388
 
 84,338
32,888
 29,235
 51,769
 
 113,892
Income (loss) from operations(39,000) (31,323) 61,624
 
 (8,699)
Loss from operations(32,888) (17,772) (3,612) 
 (54,272)
Interest expense, net(16,729) (107) 127
 
 (16,709)(13,010) (136) 174
 
 (12,972)
Intercompany interest, net1,084
 (6,613) 5,529
 
 
1,124
 (12,137) 11,013
 
 
Equity in earnings (losses) of investments27,696
 67,290
 
 (94,986) 
(26,446) 37,219
 
 (10,773) 
Other income (expense)(4,610) (382) 1,047
 
 (3,945)(196) 116
 (356) 
 (436)
Income (loss) before income taxes(31,559) 28,865
 68,327
 (94,986) (29,353)(71,416) 7,290
 7,219
 (10,773) (67,680)
Income tax expense (benefit)(1,317) (3,175) 4,516
 
 24
(245) (6,711) 9,674
 
 2,718
Net income (loss)(30,242) 32,040
 63,811
 (94,986) (29,377)(71,171) 14,001
 (2,455) (10,773) (70,398)
Net income attributable to noncontrolling interests
 
 (865) 
 (865)
 
 (773) 
 (773)
Net income (loss) attributable to ION$(30,242) $32,040
 $62,946
 $(94,986) $(30,242)$(71,171) $14,001
 $(3,228) $(10,773) $(71,171)
Comprehensive net income (loss)$(27,373) $31,992
 $65,916
 $(97,043) $(26,508)$(72,734) $13,953
 $(4,797) $(8,383) $(71,961)
Comprehensive income attributable to noncontrolling interest
 
 (865) 
 (865)
 
 (773) 
 (773)
Comprehensive net income (loss) attributable to ION$(27,373) $31,992
 $65,051
 $(97,043) $(27,373)$(72,734) $13,953
 $(5,570) $(8,383) $(72,734)
                  
Year Ended December 31, 2016Year Ended December 31, 2017
Income StatementION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total Consolidated
(In thousands)(In thousands)
Total net revenues$
 $79,006
 $93,802
 $
 $172,808
$
 $148,590
 $48,964
 $
 $197,554
Cost of goods sold
 84,373
 52,403
 
 136,776

 90,754
 31,161
 
 121,915
Gross profit (loss)
 (5,367) 41,399
 
 36,032
Gross profit
 57,836
 17,803
 
 75,639
Total operating expenses31,438
 27,274
 20,491
 
 79,203
39,000
 28,020
 17,318
 
 84,338
Income (loss) from operations(31,438) (32,641) 20,908
 
 (43,171)(39,000) 29,816
 485
 
 (8,699)
Interest expense, net(18,406) (173) 94
 
 (18,485)(16,729) (107) 127
 
 (16,709)
Intercompany interest, net978
 (4,397) 3,419
 
 
1,084
 (6,613) 5,529
 
 
Equity in earnings (losses) of investments(19,756) 23,368
 
 (3,612) 
27,696
 67,290
 
 (94,986) 
Other income (expense)3,528
 702
 (2,880) 
 1,350
(4,610) (407) 1,072
 
 (3,945)
Income (loss) before income taxes(65,094) (13,141) 21,541
 (3,612) (60,306)(31,559) 89,979
 7,213
 (94,986) (29,353)
Income tax expense54
 1,337
 3,030
 
 4,421
Income tax expense (benefit)(1,317) (1,427) 2,768
 
 24
Net income (loss)(65,148) (14,478) 18,511
 (3,612) (64,727)(30,242) 91,406
 4,445
 (94,986) (29,377)
Net income attributable to noncontrolling interests
 
 (421) 
 (421)
 
 (865) 
 (865)
Net income (loss) attributable to ION$(65,148) $(14,478) $18,090
 $(3,612) $(65,148)$(30,242) $91,406
 $3,580
 $(94,986) $(30,242)
Comprehensive net income (loss)$(72,331) $(14,478) $10,907
 $4,208
 $(71,694)$(27,373) $91,358
 $6,550
 $(97,043) $(26,508)
Comprehensive loss attributable to noncontrolling interest
 
 (421) 
 (421)
Comprehensive income attributable to noncontrolling interest
 
 (865) 
 (865)
Comprehensive net income (loss) attributable to ION$(72,331) $(14,478) $10,486
 $4,208
 $(72,115)$(27,373) $91,358
 $5,685
 $(97,043) $(27,373)
                  
        

Year Ended December 31, 2015Year Ended December 31, 2016
Income StatementION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Consolidating Adjustments Total Consolidated
(In thousands)(In thousands)
Total net revenues$
 $145,615
 $76,954
 $(1,056) $221,513
$
 $91,465
 $81,343
 $
 $172,808
Cost of goods sold
 126,176
 88,390
 (1,056) 213,510

 87,660
 49,116
 
 136,776
Gross profit (loss)
 19,439
 (11,436) 
 8,003
Gross profit
 3,805
 32,227
 
 36,032
Total operating expenses26,091
 47,579
 34,965
 
 108,635
31,438
 27,279
 20,486
 
 79,203
Loss from operations(26,091) (28,140) (46,401) 
 (100,632)
Income (loss) from operations(31,438) (23,474) 11,741
 
 (43,171)
Interest expense, net(18,434) (351) 32
 
 (18,753)(18,406) (173) 94
 
 (18,485)
Intercompany interest, net697
 (3,140) 2,443
 
 
978
 (4,397) 3,419
 
 
Equity in earnings (losses) of investments16,604
 (42,953) 
 26,349
 
(19,756) 23,368
 
 (3,612) 
Other income (expense)192
 101,978
 (3,895) 
 98,275
3,528
 723
 (2,901) 
 1,350
Income (loss) before income taxes(27,032) 27,394
 (47,821) 26,349
 (21,110)(65,094) (3,953) 12,353
 (3,612) (60,306)
Income tax expense (benefit)(1,910) 5,031
 923
 
 4,044
Income tax expense54
 1,337
 3,030
 
 4,421
Net income (loss)(25,122) 22,363
 (48,744) 26,349
 (25,154)(65,148) (5,290) 9,323
 (3,612) (64,727)
Net loss attributable to noncontrolling interests
 
 32
 
 32
Net income attributable to noncontrolling interests
 
 (421) 
 (421)
Net income (loss) attributable to ION$(25,122) $22,363
 $(48,712) $26,349
 $(25,122)$(65,148) $(5,290) $8,902
 $(3,612) $(65,148)
Comprehensive net income (loss)$(27,096) $20,553
 $(50,551) $29,966
 $(27,128)$(72,331) $(5,290) $1,719
 $4,208
 $(71,694)
Comprehensive income attributable to noncontrolling interest
 
 32
 
 32

 
 (421) 
 (421)
Comprehensive net income (loss) attributable to ION$(27,096) $20,553
 $(50,519) $29,966
 $(27,096)$(72,331) $(5,290) $1,298
 $4,208
 $(72,115)
                  

 Year Ended December 31, 2018
Statement of Cash FlowsION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
 (In thousands)
Cash flows from operating activities:      

Net cash provided by (used in) operating activities$(37,659) $39,407
 $5,350
 $7,098
Cash flows from investing activities:       
Investment in multi-client data library
 (25,307) (2,969) (28,276)
Purchase of property, plant, equipment and seismic rental equipment(392) (959) (163) (1,514)
Net cash used in investing activities(392) (26,266) (3,132) (29,790)
Cash flows from financing activities:       
Repayments under revolving line of credit(10,000) 
 
 (10,000)
Payments on notes payable and long-term debt(30,169) (638) 
 (30,807)
Cost associated with issuance of debt(1,247) 
 
 (1,247)
Intercompany lending7,983
 (12,522) 4,539
 
Proceeds from employee stock purchases and exercise of stock options214
 
 
 214
Net proceeds from issuance of stocks46,999
 
 
 46,999
Dividend payment to noncontrolling interest(200) 
 
 (200)
Other financing activities(1,151) 
 
 (1,151)
Net cash provided by (used in) financing activities12,429
 (13,160) 4,539
 3,808
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash
 
 319
 319
Net increase (decrease) in cash and cash equivalents(25,622) (19) 7,076
 (18,565)
Cash, cash equivalents and restricted cash at beginning of period39,707
 66
 12,646
 52,419
Cash, cash equivalents and restricted cash at end of period$14,085
 $47
 $19,722
 $33,854
.
The following table is a reconciliation of cash, cash equivalents and restricted cash:
 Year Ended December 31, 2017
Statement of Cash FlowsION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
 (In thousands)
Cash flows from operating activities:      

Net cash provided by (used in) operating activities$(21,897) $61,390
 $(11,463) $28,030
Cash flows from investing activities:       
Investment in multi-client data library
 (11,797) (11,913) (23,710)
Purchase of property, plant, equipment and seismic rental equipment(165) (817) (81) (1,063)
Net cash used in investing activities(165) (12,614) (11,994) (24,773)
Cash flows from financing activities:       
Payments on notes payable and long-term debt(1,591) (3,167) (58) (4,816)
Cost associated with issuance of debt(53) 
 
 (53)
Intercompany lending38,732
 (45,609) 6,877
 
Proceeds from employee stock purchases and exercise of stock options1,619
 
 
 1,619
Dividend payment to non-controlling interest(100) 
 
 (100)
Other financing activities(243) 
 
 (243)
Net cash provided by (used in) financing activities38,364
 (48,776) 6,819
 (3,593)
Effect of change in foreign currency exchange rates on cash and cash equivalents
 
 (260) (260)
Net increase (decrease) in cash and cash equivalents16,302
 
 (16,898) (596)
Cash and cash equivalents at beginning of period23,042
 
 29,610
 52,652
Cash and cash equivalents at end of period$39,344
 $
 $12,712
 $52,056
 December 31, 2018
 ION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
 (In thousands)
Cash and cash equivalents$13,782
 $47
 $19,722
 $33,551
Restricted cash included in other long-term assets303
 
 
 303
Total cash, cash equivalents, and restricted cash shown in statements of cash flows$14,085
 $47
 $19,722
 $33,854
        

Year Ended December 31, 2016Year Ended December 31, 2017
Statement of Cash FlowsION Geophysical Corporation The Guarantors All Other Subsidiaries Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
(In thousands)(In thousands)
Cash flows from operating activities:              
Net cash provided by (used in) operating activities$(30,154) $52,385
 $(20,660) $1,571
$(22,315) $73,154
 $(23,227) $27,612
Cash flows from investing activities:              
Investment in multi-client data library
 (10,985) (3,899) (14,884)
 (23,710) 
 (23,710)
Purchase of property, plant, equipment and seismic rental equipment(73) (343) (1,072) (1,488)(165) (817) (81) (1,063)
Proceeds from sale of a cost-method investment2,698
 
 
 2,698
Other investing activities
 30
 
 30
Net cash provided by (used in) investing activities2,625
 (11,298) (4,971) (13,644)
Net cash used in investing activities(165) (24,527) (81) (24,773)
Cash flows from financing activities:              
Borrowings under revolving line of credit15,000
 
 
 15,000
Repayments under revolving line of credit(5,000) 
 
 (5,000)
Payments on notes payable and long-term debt(2,070) (6,316) (248) (8,634)(1,591) (3,167) (58) (4,816)
Cost associated with issuance of debt(6,744) 
 
 (6,744)(53) 
 
 (53)
Repurchase of common stock(964) 
 
 (964)
Intercompany lending31,867
 (34,771) 2,904
 
38,732
 (45,609) 6,877
 
Payments to repurchase bonds(15,000) 
 
 (15,000)
Proceeds from employee stock purchases and exercise of stock options1,619
 
 
 1,619
Dividend payment to noncontrolling interest(100) 
 
 (100)
Other financing activities(252) 
 
 (252)(243) 
 
 (243)
Net cash provided by (used in) financing activities16,837
 (41,087) 2,656
 (21,594)38,364
 (48,776) 6,819
 (3,593)
Effect of change in foreign currency exchange rates on cash and cash equivalents
 
 1,386
 1,386
Net decrease in cash and cash equivalents(10,692) 
 (21,589) (32,281)
Cash and cash equivalents at beginning of period33,734
 
 51,199
 84,933
Cash and cash equivalents at end of period$23,042
 $
 $29,610
 $52,652
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash
 
 (260) (260)
Net increase (decrease) in cash and cash equivalents15,884
 (149) (16,749) (1,014)
Cash, cash equivalents and restricted cash at beginning of period23,823
 215
 29,395
 53,433
Cash, cash equivalents and restricted cash at end of period$39,707
 $66
 $12,646
 $52,419
The following table is a reconciliation of cash, cash equivalents and restricted cash:
 December 31, 2017
 ION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
 (In thousands)
Cash and cash equivalents$39,344
 $66
 $12,646
 $52,056
Restricted cash included in prepaid expenses and other current assets60
 
 
 60
Restricted cash included in other long-term assets303
 
 
 303
Total cash, cash equivalents, and restricted cash shown in statements of cash flows$39,707
 $66
 $12,646
 $52,419
        

Year Ended December 31, 2015Year Ended December 31, 2016
Statement of Cash FlowsION Geophysical Corporation The Guarantors All Other Subsidiaries Total ConsolidatedION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
(In thousands)(In thousands)
Cash flows from operating activities:              
Net cash provided by (used in) operating activities$(425,310) $225,581
 $183,205
 $(16,524)$(30,732) $53,107
 $(21,382) $993
Cash flows from investing activities:              
Investment in multi-client data library
 (44,687) (871) (45,558)
 (14,884) 
 (14,884)
Purchase of property, plant and equipment(347) (3,945) (14,949) (19,241)(73) (313) (1,072) (1,458)
Other investing activities
 1,263
 
 1,263
Net cash used in investing activities(347) (47,369) (15,820) (63,536)
Proceeds from sale of a cost-method investment2,698
 
 
 2,698
Net cash provided by (used in) investing activities2,625
 (15,197) (1,072) (13,644)
Cash flows from financing activities:              
Payments under revolving line of credit(5,000) 
 
 (5,000)
Borrowings under revolving line of credit15,000
 
 
 15,000
Payments on notes payable and long-term debt(153) (6,467) (832) (7,452)(17,070) (6,316) (248) (23,634)
Cost associated with issuance of debt(145) 
 
 (145)(6,744) 
 
 (6,744)
Repurchase of common stock(1,989) 
 
 (1,989)(964) 
 
 (964)
Intercompany lending352,091
 (171,745) (180,346) 
31,867
 (34,771) 2,904
 
Other financing activities73
 
 
 73
(252) 
 
 (252)
Net cash provided by (used in) financing activities349,877
 (178,212) (181,178) (9,513)16,837
 (41,087) 2,656
 (21,594)
Effect of change in foreign currency exchange rates on cash and cash equivalents
 
 898
 898
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash
 
 1,386
 1,386
Net decrease in cash and cash equivalents(75,780) 
 (12,895) (88,675)(11,270) (3,177) (18,412) (32,859)
Cash and cash equivalents at beginning of period109,514
 
 64,094
 173,608
Cash and cash equivalents at end of period$33,734
 $
 $51,199
 $84,933
Cash, cash equivalents and restricted cash at beginning of period35,093
 3,392
 47,807
 86,292
Cash, cash equivalents and restricted cash at end of period$23,823
 $215
 $29,395
 $53,433
The following table is a reconciliation of cash, cash equivalents and restricted cash:
 December 31, 2016
 ION Geophysical Corporation The Guarantors All Other Subsidiaries Total Consolidated
 (In thousands)
Cash and cash equivalents$23,042
 $215
 $29,395
 $52,652
Restricted cash included in prepaid expenses and other current assets260
 
 
 260
Restricted cash included in other long-term assets521
 
 
 521
Total cash, cash equivalents, and restricted cash shown in statements of cash flows$23,823
 $215
 $29,395
 $53,433


        

SCHEDULE II
ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS
 
Year Ended December 31, 2015Balance at
Beginning of Year
 Charged (Credited) to
Costs and Expenses
 Deductions Balance at
End of Year
 (In thousands)
Allowances for doubtful accounts$7,633
 $1,841
 $(4,555) $4,919
Allowances for doubtful notes receivable4,000
 
 
 4,000
Valuation allowance on deferred tax assets205,264
 (11,009) 
 194,255
Excess and obsolete inventory29,804
 151
 (5,480) 24,475
Year Ended December 31, 2016Balance at
Beginning of Year
 Charged (Credited) to
Costs and Expenses
 Deductions Balance at
End of Year
 (In thousands)
Allowances for doubtful accounts$4,919
 $1,834
 $(5,310) $1,443
Allowances for doubtful notes receivable4,000
 
 
 4,000
Valuation allowance on deferred tax assets194,255
 23,334
 
 217,589
Excess and obsolete inventory24,475
 429
 (9,855) 15,049
Year Ended December 31, 2017Balance at
Beginning of Year
 Charged (Credited) to
Costs and Expenses
 Deductions Balance at
End of Year
 (In thousands)
Allowances for doubtful accounts$1,443
 $949
 $(1,820) $572
Allowances for doubtful notes receivable4,000
 
 
 4,000
Valuation allowance on deferred tax assets217,589
 (64,126) 
 153,463
Excess and obsolete inventory15,049
 398
 (408) 15,039
Year Ended December 31, 2018
Balance at
Beginning of Year
 
Charged (Credited) to
Costs and Expenses
 Deductions 
Balance at
End of Year
 (In thousands)
Allowances for doubtful accounts$572
 $222
 $(364) $430
Allowances for doubtful notes receivable4,000
 
 
 4,000
Valuation allowance on deferred tax assets153,463
 7,042
 
 160,505
Excess and obsolete inventory15,039
 665
 (680) 15,024


S-1