Cover
Cover - USD ($) | Dec. 31, 2020 | Dec. 31, 2020 | Feb. 08, 2021 | Jun. 30, 2020 |
Cover [Abstract] | ||||
Document Type | 10-K/A | |||
Amendment Flag | false | |||
Document Annual Report | true | |||
Document Transition Report | false | |||
Document Period End Date | Dec. 31, 2020 | |||
Document Fiscal Period Focus | FY | |||
Document Fiscal Year Focus | 2020 | |||
Current Fiscal Year End Date | --12-31 | |||
Entity File Number | 1-12691 | |||
Entity Registrant Name | ION Geophysical Corporation | |||
Entity Central Index Key | 0000866609 | |||
Entity Tax Identification Number | 22-2286646 | |||
Entity Incorporation, State or Country Code | DE | |||
Entity Address, Address Line One | 2105 CityWest Blvd | |||
Entity Address, Address Line Two | Suite 100 | |||
Entity Address, City or Town | Houston | |||
Entity Address, State or Province | TX | |||
Entity Address, Postal Zip Code | 77042-2855 | |||
City Area Code | 281 | |||
Local Phone Number | 933-3339 | |||
Title of 12(b) Security | Common Stock, $0.01 par value | |||
Trading Symbol | IO | |||
Security Exchange Name | NYSE | |||
Entity Well-known Seasoned Issuer | No | |||
Entity Voluntary Filers | No | |||
Entity Current Reporting Status | Yes | |||
Entity Interactive Data Current | Yes | |||
Entity Filer Category | Non-accelerated Filer | |||
Entity Small Business | false | |||
Entity Emerging Growth Company | false | |||
Entity Shell Company | false | |||
Entity Public Float | $ 26,800,000 | |||
Entity Common Stock, Shares Outstanding | 28,811,207 | |||
ICFR Auditor Attestation Flag | true |