Document and Entity Information
Document and Entity Information - shares | 9 Months Ended | |
Sep. 30, 2023 | Oct. 25, 2023 | |
Cover [Abstract] | ||
Document Type | 10-Q | |
Amendment Flag | false | |
Document Period End Date | Sep. 30, 2023 | |
Document Fiscal Year Focus | 2023 | |
Document Fiscal Period Focus | Q3 | |
Trading Symbol | NVRO | |
Entity Registrant Name | Nevro Corp. | |
Entity Central Index Key | 0001444380 | |
Current Fiscal Year End Date | --12-31 | |
Entity Filer Category | Large Accelerated Filer | |
Entity Current Reporting Status | Yes | |
Entity Small Business | false | |
Entity Shell Company | false | |
Entity Emerging Growth Company | false | |
Entity Common Stock, Shares Outstanding | 36,205,495 | |
Entity File Number | 001-36715 | |
Entity Tax Identification Number | 56-2568057 | |
Entity Address, Address Line One | 1800 Bridge Parkway | |
Entity Address, City or Town | Redwood City | |
Entity Address, State or Province | CA | |
Entity Address, Postal Zip Code | 94065 | |
City Area Code | 650 | |
Local Phone Number | 251-0005 | |
Entity Interactive Data Current | Yes | |
Entity Incorporation, State or Country Code | DE | |
Security Exchange Name | NYSE | |
Document Quarterly Report | true | |
Document Transition Report | false | |
Title of 12(b) Security | Common Stock, $0.001 par value per share |
Condensed Consolidated Balance
Condensed Consolidated Balance Sheets - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Current assets | ||
Cash and cash equivalents | $ 65,155 | $ 120,373 |
Short-term investments | 255,103 | 254,012 |
Accounts receivable, net of allowance for doubtful accounts of $853 and $1,270 at September 30, 2023 and December 31, 2022, respectively | 68,984 | 78,930 |
Inventories | 122,420 | 99,638 |
Prepaid expenses and other current assets | 10,321 | 9,984 |
Total current assets | 521,983 | 562,937 |
Property and equipment, net | 24,031 | 22,271 |
Operating lease assets | 10,099 | 13,430 |
Other assets | 4,863 | 3,164 |
Restricted cash | 606 | 606 |
Total assets | 561,582 | 602,408 |
Current liabilities | ||
Accounts payable | 28,854 | 26,849 |
Accrued liabilities | 45,302 | 47,168 |
Other current liabilities | 5,587 | 5,195 |
Total current liabilities | 79,743 | 79,212 |
Long-term debt | 187,803 | 186,867 |
Long-term operating lease liabilities | 6,105 | 10,296 |
Other long-term liabilities | 2,265 | 2,157 |
Total liabilities | 275,916 | 278,532 |
Commitments and contingencies (Note 6) | ||
Stockholders’ equity | ||
Preferred stock, $0.001 par value, 10,000,000 shares authorized at September 30, 2023 and December 31, 2022; zero shares issued and outstanding at September 30, 2023 and December 31, 2022 | ||
Common stock, $0.001 par value, 290,000,000 shares authorized at September 30, 2023 and December 31, 2022; 36,869,962 and 36,203,423 shares issued at September 30, 2023 and December 31, 2022, respectively; 36,187,046 and 35,520,507 shares outstanding at September 30, 2023 and December 31, 2022, respectively | 36 | 35 |
Additional paid-in capital | 978,211 | 934,132 |
Accumulated other comprehensive income (loss) | (2,152) | (3,094) |
Accumulated deficit | (690,429) | (607,197) |
Total stockholders’ equity | 285,666 | 323,876 |
Total liabilities and stockholders’ equity | $ 561,582 | $ 602,408 |
Condensed Consolidated Balanc_2
Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Statement of Financial Position [Abstract] | ||
Accounts receivable, allowance for doubtful accounts | $ 853 | $ 1,270 |
Preferred stock, par value | $ 0.001 | $ 0.001 |
Preferred stock, shares authorized | 10,000,000 | 10,000,000 |
Preferred stock, shares issued | 0 | 0 |
Preferred stock, shares outstanding | 0 | 0 |
Common stock, par value | $ 0.001 | $ 0.001 |
Common stock, shares authorized | 290,000,000 | 290,000,000 |
Common stock, shares issued | 36,869,962 | 36,203,423 |
Common stock, shares outstanding | 36,187,046 | 35,520,507 |
Condensed Consolidated Statemen
Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Income Statement [Abstract] | ||||
Revenue | $ 103,862 | $ 100,466 | $ 308,998 | $ 292,521 |
Cost of revenue | 34,346 | 31,164 | 100,415 | 91,393 |
Gross profit | 69,516 | 69,302 | 208,583 | 201,128 |
Operating expenses | ||||
Research and development | 13,923 | 14,030 | 41,998 | 39,118 |
Sales, general and administrative | 81,152 | 78,190 | 254,106 | 241,488 |
Certain litigation charges (credits) | (105,000) | (105,000) | ||
Total operating expenses | 95,075 | (12,780) | 296,104 | 175,606 |
Income (Loss) from operations | (25,559) | 82,082 | (87,521) | 25,522 |
Interest income | 3,594 | 1,128 | 10,220 | 1,553 |
Interest expense | (1,618) | (1,608) | (4,849) | (4,819) |
Other income (expense), net | 234 | 391 | (150) | 844 |
Income (Loss) before income taxes | (23,349) | 81,993 | (82,300) | 23,100 |
Provision for income taxes | 130 | 485 | 932 | 907 |
Net income (loss) | (23,479) | 81,508 | (83,232) | 22,193 |
Other comprehensive loss: | ||||
Changes in foreign currency translation adjustment | (765) | (1,690) | 77 | (3,293) |
Changes in unrealized gains on short-term investments, net | 470 | (102) | 865 | (1,384) |
Net change in other comprehensive loss | (295) | (1,792) | 942 | (4,677) |
Comprehensive income (loss) | $ (23,774) | $ 79,716 | $ (82,290) | $ 17,516 |
Net income (loss) per share, Basic | $ (0.65) | $ 2.3 | $ (2.32) | $ 0.63 |
Net income (loss) per share, Diluted | $ (0.65) | $ 2.22 | $ (2.32) | $ 0.63 |
Weighted average number of shares used to compute basic net (loss) per share | 36,142,255 | 35,402,086 | 35,882,826 | 35,265,193 |
Weighted average number of shares used to compute diluted net (loss) per share | 36,142,255 | 37,338,945 | 35,882,826 | 35,501,609 |
Condensed Consolidated Statem_2
Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Deficit [Member] | Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |
Beginning balances at Dec. 31, 2021 | $ 303,616 | $ (34,345) | $ 35 | $ 928,138 | $ (48,340) | $ (624,193) | $ 13,995 | $ (364) |
Beginning balances, shares at Dec. 31, 2021 | 35,026,654 | |||||||
Accounting Standards Update [Extensible Enumeration] | us-gaap:AccountingStandardsUpdate202006Member | us-gaap:AccountingStandardsUpdate202006Member | us-gaap:AccountingStandardsUpdate202006Member | |||||
Exercise of common stock options | 545 | 545 | ||||||
Exercise of common stock options, shares | 10,642 | |||||||
Issuance of common stock upon release of restricted stock units, shares | 263,412 | |||||||
Shares withheld for tax obligations | (7,298) | (7,298) | ||||||
Shares withheld for tax obligations, shares | (107,257) | |||||||
Stock based compensation | 13,406 | 13,406 | ||||||
Net Income (Loss) | (34,325) | (34,325) | ||||||
Change in other comprehensive loss | (1,213) | (1,213) | ||||||
Ending balances at Mar. 31, 2022 | 240,386 | $ 35 | 886,451 | (644,523) | (1,577) | |||
Ending balances, shares at Mar. 31, 2022 | 35,193,451 | |||||||
Beginning balances at Dec. 31, 2021 | 303,616 | $ (34,345) | $ 35 | 928,138 | $ (48,340) | (624,193) | $ 13,995 | (364) |
Beginning balances, shares at Dec. 31, 2021 | 35,026,654 | |||||||
Net Income (Loss) | 22,193 | |||||||
Change in other comprehensive loss | (4,677) | |||||||
Ending balances at Sep. 30, 2022 | 324,935 | $ 35 | 917,946 | (588,005) | (5,041) | |||
Ending balances, shares at Sep. 30, 2022 | 35,424,599 | |||||||
Beginning balances at Mar. 31, 2022 | 240,386 | $ 35 | 886,451 | (644,523) | (1,577) | |||
Beginning balances, shares at Mar. 31, 2022 | 35,193,451 | |||||||
Exercise of common stock options | 230 | 230 | ||||||
Exercise of common stock options, shares | 5,100 | |||||||
Issuance of common stock upon release of restricted stock units, shares | 109,742 | |||||||
Shares withheld for tax obligations | (759) | (759) | ||||||
Shares withheld for tax obligations, shares | (12,323) | |||||||
Issuance of common stock under employee stock purchase plan | 3,414 | 3,414 | ||||||
Issuance of common stock under employee stock purchase plan, shares | 84,837 | |||||||
Stock based compensation | 13,376 | 13,376 | ||||||
Net Income (Loss) | (24,990) | (24,990) | ||||||
Change in other comprehensive loss | (1,672) | (1,672) | ||||||
Ending balances at Jun. 30, 2022 | 229,985 | $ 35 | 902,712 | (669,513) | (3,249) | |||
Ending balances, shares at Jun. 30, 2022 | 35,380,807 | |||||||
Exercise of common stock options | 366 | 366 | ||||||
Exercise of common stock options, shares | 8,749 | |||||||
Issuance of common stock upon release of restricted stock units, shares | 42,038 | |||||||
Shares withheld for tax obligations | (329) | (329) | ||||||
Shares withheld for tax obligations, shares | (6,995) | |||||||
Stock based compensation | 15,197 | 15,197 | ||||||
Net Income (Loss) | 81,508 | 81,508 | ||||||
Change in other comprehensive loss | (1,792) | (1,792) | ||||||
Ending balances at Sep. 30, 2022 | 324,935 | $ 35 | 917,946 | (588,005) | (5,041) | |||
Ending balances, shares at Sep. 30, 2022 | 35,424,599 | |||||||
Beginning balances at Dec. 31, 2022 | 323,876 | $ 35 | 934,132 | (607,197) | (3,094) | |||
Beginning balances, shares at Dec. 31, 2022 | 35,520,507 | |||||||
Issuance of common stock upon release of restricted stock units | $ 1 | (1) | ||||||
Issuance of common stock upon release of restricted stock units, shares | 243,276 | |||||||
Shares withheld for tax obligations | (2,273) | (2,273) | ||||||
Shares withheld for tax obligations, shares | (69,763) | |||||||
Stock based compensation | 13,561 | 13,561 | ||||||
Net Income (Loss) | (35,029) | (35,029) | ||||||
Change in other comprehensive loss | 1,093 | 1,093 | ||||||
Ending balances at Mar. 31, 2023 | 301,228 | $ 36 | 945,419 | (642,226) | (2,001) | |||
Ending balances, shares at Mar. 31, 2023 | 35,694,020 | |||||||
Beginning balances at Dec. 31, 2022 | 323,876 | $ 35 | 934,132 | (607,197) | (3,094) | |||
Beginning balances, shares at Dec. 31, 2022 | 35,520,507 | |||||||
Net Income (Loss) | (83,232) | |||||||
Change in other comprehensive loss | 942 | |||||||
Ending balances at Sep. 30, 2023 | 285,666 | $ 36 | 978,211 | (690,429) | (2,152) | |||
Ending balances, shares at Sep. 30, 2023 | 36,187,046 | |||||||
Beginning balances at Mar. 31, 2023 | 301,228 | $ 36 | 945,419 | (642,226) | (2,001) | |||
Beginning balances, shares at Mar. 31, 2023 | 35,694,020 | |||||||
Exercise of common stock options | 1,455 | 1,455 | ||||||
Exercise of common stock options, shares | 83,058 | |||||||
Issuance of common stock upon release of restricted stock units, shares | 185,918 | |||||||
Shares withheld for tax obligations | (1,080) | (1,080) | ||||||
Shares withheld for tax obligations, shares | (38,463) | |||||||
Issuance of common stock under employee stock purchase plan | 3,747 | 3,747 | ||||||
Issuance of common stock under employee stock purchase plan, shares | 155,589 | |||||||
Stock based compensation | 13,980 | 13,980 | ||||||
Net Income (Loss) | (24,724) | (24,724) | ||||||
Change in other comprehensive loss | 144 | 144 | ||||||
Ending balances at Jun. 30, 2023 | 294,750 | $ 36 | 963,521 | (666,950) | (1,857) | |||
Ending balances, shares at Jun. 30, 2023 | 36,080,122 | |||||||
Issuance of common stock upon release of restricted stock units, shares | 151,148 | |||||||
Shares withheld for tax obligations | (1,012) | (1,012) | ||||||
Shares withheld for tax obligations, shares | (44,224) | |||||||
Stock based compensation | 15,702 | 15,702 | ||||||
Net Income (Loss) | (23,479) | (23,479) | ||||||
Change in other comprehensive loss | (295) | (295) | ||||||
Ending balances at Sep. 30, 2023 | $ 285,666 | $ 36 | $ 978,211 | $ (690,429) | $ (2,152) | |||
Ending balances, shares at Sep. 30, 2023 | 36,187,046 |
Condensed Consolidated Statem_3
Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended | |
Sep. 30, 2023 | Sep. 30, 2022 | |
Cash flows from operating activities | ||
Net income (loss) | $ (83,232) | $ 22,193 |
Adjustments to reconcile net loss to net cash used in operating activities | ||
Depreciation and amortization | 4,935 | 4,658 |
Amortization of operating lease assets | 3,330 | 3,080 |
Stock-based compensation expense | 43,249 | 41,992 |
Amortization of premium (accretion of discount) on short-term investments | (2,766) | 888 |
Provision for doubtful accounts | 391 | 280 |
Write-down of inventory | 2,969 | 3,638 |
Amortization of debt discount and issuance costs | 935 | 905 |
Unrealized (gains) losses on foreign currency transactions | (492) | (1,737) |
Changes in operating assets and liabilities | ||
Accounts receivable | 9,350 | (964) |
Inventories | (24,834) | (7,207) |
Prepaid expenses and other current assets | (362) | (5,949) |
Other assets | 208 | 1,325 |
Accounts payable | 2,050 | (310) |
Accrued liabilities | (1,554) | (1,000) |
Other long-term liabilities | (4,083) | (23,694) |
Net cash provided by (used in) operating activities | (49,906) | 38,098 |
Cash flows from investing activities | ||
Purchases of short-term investments | (169,869) | (188,063) |
Proceeds from maturity of short-term investments | 172,410 | 257,050 |
Investment in private company | (1,900) | |
Purchases of property and equipment | (6,732) | (5,155) |
Net cash provided by (used in) investing activities | (6,091) | 63,832 |
Cash flows from financing activities | ||
Minimum tax withholding paid on behalf of employees for net share settlement | (4,366) | (8,386) |
Proceeds from issuance of common stock to employees | 5,202 | 4,555 |
Net cash provided by (used in) financing activities | 836 | (3,831) |
Effect of exchange rate changes on cash and cash equivalents | (57) | (1,970) |
Net increase (decrease) in cash, cash equivalents and restricted cash | (55,218) | 96,129 |
Cash, cash equivalents and restricted cash | ||
Cash, cash equivalents and restricted cash at beginning of period | 120,979 | 35,316 |
Cash, cash equivalents and restricted cash at end of period | 65,761 | 131,445 |
Significant non-cash transactions | ||
Purchases of property and equipment in accounts payable | $ 728 | $ 533 |
Pay vs Performance Disclosure
Pay vs Performance Disclosure - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||||||
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Pay vs Performance Disclosure | ||||||||
Net Income (Loss) | $ (23,479) | $ (24,724) | $ (35,029) | $ 81,508 | $ (24,990) | $ (34,325) | $ (83,232) | $ 22,193 |
Insider Trading Arrangements
Insider Trading Arrangements | 9 Months Ended |
Sep. 30, 2023 | |
Trading Arrangements, by Individual | |
Rule 10b5-1 Arrangement Adopted | false |
Non-Rule 10b5-1 Arrangement Adopted | false |
Rule 10b5-1 Arrangement Terminated | false |
Non-Rule 10b5-1 Arrangement Terminated | false |
Summary of Significant Accounti
Summary of Significant Accounting Policies | 9 Months Ended |
Sep. 30, 2023 | |
Accounting Policies [Abstract] | |
Summary of Significant Accounting Policies | 1. Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated financial statements as of September 30, 2023 and for the three and nine months ended September 30, 2023 and 2022, and the related interim information contained within the notes to the financial statements, are unaudited. The unaudited interim condensed consolidated financial statements (the condensed consolidated financial statements) have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) for interim financial information and on the same basis as the audited financial statements included on the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (the Annual Report) filed with the Securities and Exchange Commission (SEC) on February 21, 2023. The condensed consolidated financial statements are prepared in U.S. dollars and include the Company’s accounts and those of its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to state fairly the Company’s financial position as of September 30, 2023, the results of its operations for the three and nine months ended September 30, 2023 and 2022 and the consolidated statements of cash flows for the nine months ended September 30, 2023 and 2022. All such adjustments are of a normal and recurring nature. The interim financial data as of September 30, 2023 is not necessarily indicative of the results to be expected for the year ending December 31, 2023, or for any future period. The consolidated balance sheet as of December 31, 2022 was derived from the audited financials as of that date. The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended December 31, 2022 included in the Annual Report. Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions believed to be reasonable by management. Actual results may differ from those estimates under different assumptions or conditions. Foreign Currency Translation Unrealized foreign exchange gains and losses from the remeasurement of assets and liabilities denominated in currencies other than the functional currency of the reporting entity are recorded in other income (expense), net. Additionally, realized gains and losses resulting from transactions denominated in currencies other than the local currency are recorded in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss. The Company recorded net unrealized and net realized foreign currency transaction gains (losses) during the periods presented as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net unrealized foreign currency gain (loss) $ 547 $ 1,026 $ 402 $ 2,249 Net realized foreign currency gain (loss) ( 259 ) ( 585 ) ( 396 ) ( 1,296 ) Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies from its Annual Report. |
Revenue
Revenue | 9 Months Ended |
Sep. 30, 2023 | |
Revenue from Contract with Customer [Abstract] | |
Revenue | 2. Revenue The following table presents revenue by geography, based on the billing address of the customer (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 United States $ 89,760 $ 86,130 $ 265,042 $ 248,393 International 14,102 14,336 43,956 44,128 Total revenue $ 103,862 $ 100,466 $ 308,998 $ 292,521 The United States is the only country that accounts for 10% or more of the revenue during the periods presented: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 United States 86 % 86 % 86 % 85 % There were no customers that accounted for 10 % or more of the Company’s revenue for each of the three and nine months ended September 30, 2023 and 2022 . Additionally, there were no customers that accounted for 10 % or more of the Company’s accounts receivable balance as of September 30, 2023 and December 31, 2022. For the three and nine months ended September 30, 2023, the Company recognized bad debt expenses of $ 0 and $ 0.4 million, respectively. For each of the three and nine months ended September 30, 2022 , the Company recognized bad debt credits of $ 7,000 and expenses of $ 0.2 million, respectively. In July 2021, the Company received FDA approval of its proprietary 10 kHz Therapy for the management of chronic intractable pain of the lower limbs, including unilateral or bilateral pain, associated with painful diabetic neuropathy (PDN). For the three and nine months ended September 30, 2023 , PDN represented 20 % and 18 % of worldwide permanent implant procedures, respectively, which resulted in approximately $ 20.8 million and $ 55.5 million in revenue, respectively. For the three and nine months ended September 30, 2022 , PDN represented 13 % and 11 % of worldwide permanent implant procedures, respectively, which resulted in approximately $ 13.4 million and $ 30.4 million in revenue, respectively. The Company classifies PDN revenue by using estimates and assumptions based on historical experiences and knowledge of current conditions, given available information. |
Lease Accounting
Lease Accounting | 9 Months Ended |
Sep. 30, 2023 | |
Leases [Abstract] | |
Lease Accounting | 3. Lease Accounting The Company has operating leases for office space, a manufacturing facility, warehouse, research and development facilities and equipment. Leases with terms of 12 months or less are not recorded on the balance sheet, as the related lease expenses are recognized on a straight-line basis over the lease term. The Company accounts for lease components (such as fixed payments) separately from non-lease components (such as common area expenses). The weighted average lease terms and discounts rates are as follows: September 30, 2023 December 31, 2022 Operating Lease Term and Discount Rate Weighted-average remaining lease term 2.89 years 3.38 years Weighted-average discount rate 7.0 % 7.0 % As of September 30, 2023, the maturity of lease liabilities are as follows (in thousands): Operating Leases 2023, remaining months $ 1,523 2024 6,201 2025 2,849 2026 405 2027 417 Thereafter 1,561 Total lease payments 12,956 Less: Interest ( 1,264 ) Present value of lease liabilities $ 11,692 Supplemental lease cost information are as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Operating lease cost $ 1,342 $ 1,342 $ 4,027 $ 4,027 Supplemental balance sheet information are as follows (in thousands): September 30, 2023 December 31, 2022 Operating Leases: Operating lease assets $ 10,099 $ 13,430 Other current liabilities $ 5,587 $ 5,195 Long term operating lease liabilities 6,105 10,296 Total operating lease liabilities $ 11,692 $ 15,491 Supplemental cash flow information are as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 1,523 $ 1,478 $ 4,497 $ 4,242 See Note 6 for further details of the Company’s lease commitments. |
Fair Value Measurements
Fair Value Measurements | 9 Months Ended |
Sep. 30, 2023 | |
Fair Value Disclosures [Abstract] | |
Fair Value Measurements | 4. Fair Value Measurements Cash Equivalents and Short-Term Investments The Company’s money market funds are classified within Level 1 of the fair value hierarchy and are valued based on quoted prices in active markets for identical securities. The Company’s short-term investments are comprised of agency bonds, commercial paper, corporate notes and treasury bonds. All short-term investments have been classified within Level 1 or Level 2 of the fair value hierarchy because of the sufficient observable inputs for revaluation. The Company’s Level 2 investments are valued using third-party pricing sources. The pricing services utilize industry-standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to estimate fair value. These inputs include reported trades of and broker/dealer quotes on the same or similar investments, issuer credit spreads, benchmark investments, prepayment/default projections based on historical data and other observable inputs. The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands): Balance as of September 30, 2023 Level 1 Level 2 Level 3 Total Assets: Money market funds (i) $ 46,264 $ — $ — $ 46,264 Agency bonds (ii) — 151,646 — 151,646 Commercial paper (ii) — 22,038 — 22,038 Corporate notes (ii) — 3,465 — 3,465 Treasury bonds (ii) 77,954 — — 77,954 Total assets $ 124,218 $ 177,149 $ — $ 301,367 Balance as of December 31, 2022 Level 1 Level 2 Level 3 Total Assets: Money market funds (i) $ 92,318 $ — $ — $ 92,318 Agency bonds (ii) — 183,678 — 183,678 Commercial paper (ii) — 24,742 — 24,742 Treasury bonds (ii) 45,592 — — 45,592 Total assets $ 137,910 $ 208,420 $ — $ 346,330 (i) Included in cash and cash equivalents on the condensed consolidated balance sheets. (ii) Included in short-term investments on the condensed consolidated balance sheets. Convertible Senior Notes As of September 30, 2023 and December 31, 2022 , the fair value of the 2.75 % convertible senior notes due 2025 (the 2025 Notes) was $ 179.4 million and $ 174.2 million, respectively. The fair value was determined on the basis of market prices observable for similar instruments and is considered Level 2 in the fair value hierarchy (See Note 7 for additional information regarding the 2025 Notes). |
Balance Sheet Components
Balance Sheet Components | 9 Months Ended |
Sep. 30, 2023 | |
Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
Balance Sheet Components | 5. Balance Sheet Components Cash and Cash Equivalents The Company considers all highly-liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents include money market funds in the amount of $ 46.3 million and $ 92.3 million as of September 30, 2023 and December 31, 2022, respectively. As of September 30, 2023 and December 31, 2022, the Company’s cash equivalents were held at institutions in the United States and include deposits in a money market fund which was unrestricted as to withdrawal or use. The Company also held cash in foreign banks of approximately $ 9.7 million at September 30, 2023 and $ 18.6 million at December 31, 2022 that was not insured. The Company has not experienced any losses on its deposits of cash and cash equivalents. Investments The Company measures its cash equivalents and short-term investments at fair value, with unrealized gains and losses recorded in accumulated other comprehensive income within stockholders’ equity. The Company regularly reviews its investments and evaluates the current expected credit loss by considering factors such as historical experience, market data, and the near-term prospects of the investee. The following is a summary of the gross unrealized gains and unrealized losses on the Company’s investment securities, excluding investments in money market funds (in thousands): September 30, 2023 Amortized Gross Gross Aggregate Investment Securities Agency bonds $ 152,025 $ — $ ( 379 ) $ 151,646 Commercial paper 22,054 — ( 16 ) 22,038 Corporate notes 3,469 — ( 4 ) 3,465 Treasury bonds 78,118 5 ( 169 ) 77,954 Total securities $ 255,666 $ 5 $ ( 568 ) $ 255,103 December 31, 2022 Amortized Gross Gross Aggregate Investment Securities Agency bonds $ 184,666 $ 2 $ ( 990 ) $ 183,678 Commercial paper 24,767 5 ( 30 ) 24,742 Treasury bonds 46,008 — ( 416 ) 45,592 Total securities $ 255,441 $ 7 $ ( 1,436 ) $ 254,012 Realized gains or losses and other-than-temporary impairments, if any, on available-for-sale securities are reported in other income (expense), net as incurred. The cost of securities sold is determined based on the specific identification method. The amount of realized gains and realized losses on investments recorded for the periods presented has not been material. The contractual maturities of the Company’s investment securities as of September 30, 2023 were as follows (in thousands): Amortized Cost Fair Value Amounts maturing within one year $ 208,118 $ 207,605 Amounts maturing after one year through five years 47,548 47,498 Total investment securities $ 255,666 $ 255,103 Inventories (in thousands) September 30, December 31, 2023 2022 Raw materials $ 65,239 $ 53,384 Work in process 1,411 1,195 Finished goods 55,770 45,059 Total inventories $ 122,420 $ 99,638 Inventories are stated at the lower of cost or net realizable value. Cost is determined using the standard cost method which approximates the first-in, first-out basis. Net realizable value is determined as the prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company regularly reviews inventory quantities compared to forecasted sales to record a provision for excess and obsolete inventory when appropriate. Inventory write-downs are recorded for excess and obsolete inventory. The Company estimates forecasted sales by considering product acceptance in the marketplace, customer demand, historical sales, product obsolescence and technological innovations. The Company periodically evaluates the carrying value of inventory on hand for potential excess amount over demand using the same lower of cost or net realizable value approach as that has been used to value the inventory. The Company also periodically evaluates inventory quantities in consideration of actual loss experience. As a result of these evaluations, the Company recognized total write-downs of $ 0.1 million and $ 1.4 million, for its inventories for the three months ended September 30, 2023 and 2022, respectively, and $ 3.0 million and $ 3.6 million for the nine months ended September 30, 2023 and 2022 , respectively. Property and Equipment, Net (in thousands) September 30, December 31, 2023 2022 Laboratory and manufacturing equipment $ 13,269 $ 11,482 Computer equipment and software 23,599 18,626 Furniture and fixtures 4,618 4,421 Leasehold improvements 10,856 10,589 Construction in process 5,455 5,984 Total 57,797 51,102 Less: Accumulated depreciation and amortization ( 33,766 ) ( 28,831 ) Property and equipment, net $ 24,031 $ 22,271 The Company recognized depreciation and amortization expense on property and equipment as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Depreciation and amortization expense $ 1,723 $ 1,602 $ 4,935 $ 4,658 Accrued Liabilities (in thousands) September 30, December 31, 2023 2022 Accrued payroll and related expenses $ 30,546 $ 35,341 Accrued professional fees 2,819 1,425 Accrued taxes 1,617 1,910 Accrued clinical and research expenses 497 282 Accrued interest 2,609 1,305 Accrued warranty 1,477 866 Accrued other 5,737 6,039 Total accrued liabilities $ 45,302 $ 47,168 |
Commitments and Contingencies
Commitments and Contingencies | 9 Months Ended |
Sep. 30, 2023 | |
Commitments and Contingencies Disclosure [Abstract] | |
Commitments and Contingencies | 6. Commitments and Contingencies Operating Leases In March 2015 , the Company entered into a lease agreement for approximately 50,000 square feet of office space located in Redwood City, California for a period beginning on June 30, 2015 and ending in May 2022 , with initial annual payments of approximately $ 2.0 million, increasing to $ 2.4 million annually during the final year of the lease term. In December 2016, the Company entered into a first amendment to the lease for an additional approximately 50,000 square feet of office space adjacent to the premises under the original lease (the Expansion Premises), with initial annual payments of $ 1.2 million, increasing to $ 2.9 million in the final year of the amended lease term. The lease for the Expansion Premises commenced on June 1, 2018 , and it will expire on May 31, 2025 . The first amendment also extends the lease term for the original premises to terminate on the same date as the Expansion Premises. The Company entered into a separate non-cancellable facility lease for warehouse space beginning on March 1, 2017 through February 28, 2022 , under which it is obligated to pay approximately $ 0.4 million in lease payments over the term of the lease. In October 2021, the Company entered into a first amendment of the warehouse lease, which extends the lease term to terminate on May 31, 2025 and under which the Company is obligated to pay approximately $ 0.4 million over the term of the extension period. In August 2020 , the Company entered into a lease for approximately 35,411 square feet of space for a manufacturing facility in Costa Rica to begin in April 2021 and to last through June 2031 , under which it is obligated to pay approximately $ 3.9 million in lease payments over the term of the lease. On the commencement date in April 2021, the Company classified and measured the lease, resulting in the recording of operating assets of $ 2.9 million and operating lease liabilities of $ 2.9 million. See Note 3 for further discussion on Lease Accounting. Warranty Obligations The Company provides a limited one- to five-year warranty and warrants that its products will operate substantially in conformity with product specifications. The Company records an estimate for the provision for warranty claims in cost of revenue when the related revenues are recognized. This estimate is based on historical and anticipated rates of warranty claims, the cost per claim and the number of units sold. The Company regularly assesses the adequacy of its recorded warranty obligations and adjusts the amounts as necessary. Activities related to warranty obligations were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Beginning balance $ 1,349 $ 636 $ 866 $ 664 Provision for warranty 1,051 822 3,899 2,325 Utilization ( 923 ) ( 707 ) ( 3,288 ) ( 2,238 ) Ending balance $ 1,477 $ 751 $ 1,477 $ 751 Contingent Consideration In July 2023, the Company entered into an agreement with a privately-held company to, among other things, provide financing to the privately-held company. Through September 30, 2023, the Company has provided financing totaling $ 1.9 million in the form of two convertible notes. The Company has the obligation to provide additional funding of up to $ 1.0 million in the form of an additional convertible note if the privately-held company achieves certain agreed upon development milestones. Additionally, the Company may purchase shares of the most senior security in the privately-held company in two separate tranches totaling a fair value of $ 2.0 million, each tranche upon the achievement of certain development targets. As of September 30, 2023, the value of the secured convertible notes is $ 1.9 million and is reported in Other assets on the condensed consolidated balance sheet. Contingencies From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of business activities related to, for example, employment matters and patent issues. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. When determining the estimated loss or range of loss, significant judgement is required. Indemnification The Company enters into standard indemnification arrangements in the ordinary course of business. Pursuant to these arrangements, the Company indemnifies, holds harmless and agrees to reimburse the indemnified parties for losses suffered or incurred by the indemnified party, in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third-party with respect to the Company’s technology. The term of these indemnification agreements is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made. The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has director and officer insurance coverage that reduces the Company’s exposure and enables the Company to recover a portion of any future amounts paid. The Company believes the estimated fair value of these indemnification agreements in excess of applicable insurance coverage is minimal. Legal Matters The Company is and may from time to time continue to be involved in various legal proceedings to defend its intellectual property, including several pending European patent oppositions at the European Patent Office (EPO) initiated by the Company’s competitors Medtronic and Boston Scientific. In addition, the Company is and may from time to time also be involved in various legal proceedings of a character normally incident to the ordinary course of business, such as employment matters, product liability matters, and professional liability matters, which the Company does not deem to be material to its business and condensed consolidated financial statements at this stage. Flathead Partners Litigation/Arbitration On July 15, 2022, the Company filed a lawsuit in the U.S. District Court for the Northern District of California for breach of contract against Flathead Partners, LLC, the Mayo Foundation for Medical Education and Research, and Mayo Clinic Ventures (herein referred to as “Flathead Partners”). The Company’s suit alleged that Flathead Partners breached the 2006 license agreement between the Company and the Mayo Clinic (referred to in the Company’s 10-K filing as the “Mayo License”), when Flathead Partners unilaterally asserted control of pending U.S. Patent Application 16/286,389 (the “’389 Application”), which is subject to the Mayo License. The suit sought to enjoin the Flathead Partners from taking any action at the U.S. Patent Office with respect to the ‘389 Application, and to thereafter engage in an arbitration as called for in the Mayo License. On July 27, 2022, the Flathead Partners agreed to enter into an arbitration to determine which party shall have control of prosecution of the ‘389 Application, and whether there are ongoing royalty obligations under the Mayo License. Therefore, Nevro dismissed the lawsuit in the Northern District of California. The parties have since been engaged in an arbitration. An arbitration hearing was held during the week of September 11, 2023, and a ruling is expected in the fourth quarter of 2023. Civil Investigative Demand In December 2022, the Company received a civil investigative demand (CID) pursuant to the federal False Claims Act from the United States Attorney’s Office for the Northern District of California seeking information relating to the Company’s spinal cord stimulation system (SCS System). The CID primarily relates to marketing, promotion and billing practices, not the therapeutic or safety attributes of the Company’s SCS System. The Company maintains rigorous policies and procedures designed to promote compliance with the federal False Claims Act and other regulatory requirements, and is cooperating in this matter and providing the requested information. |
Debt
Debt | 9 Months Ended |
Sep. 30, 2023 | |
Debt Disclosure [Abstract] | |
Debt | 7. Debt 2025 Notes and Convertible Note Hedge and Warrant Transactions During the three months ended September 30, 2023, the conditions allowing holders of the 2025 Notes to convert have not been met. Therefore, the 2025 Notes are not convertible during the three months ended December 31, 2023. As of September 30, 2023 , the if-converted value of the 2025 Notes did no t exceed the principal value of those notes. The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, December 31, 2023 2022 Principal $ 189,750 $ 189,750 Unamortized issuance cost ( 1,947 ) ( 2,883 ) Net carrying amount $ 187,803 $ 186,867 The following table sets forth the interest expense recognized related to the 2025 Notes (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Contractual interest expense $ 1,305 $ 1,305 $ 3,914 $ 3,914 Amortization of debt issuance costs 313 303 935 904 Total interest expense $ 1,618 $ 1,608 $ 4,849 $ 4,818 |
Stock-Based Compensation
Stock-Based Compensation | 9 Months Ended |
Sep. 30, 2023 | |
Equity [Abstract] | |
Stock-Based Compensation | 8. Stock-Based Compensation The Company accounts for stock-based compensation arrangements with employees in accordance with Accounting Standards Codification (ASC) 718, Compensation—Stock Compensation. ASC 718 requires the recognition of compensation expense, using a fair value-based method, for costs related to all share-based payments including stock options. The Company estimates forfeitures expected to occur to determine the amount of compensation cost recognized in each period. In addition to restricted stock units, the Company grants performance stock units (PSUs) to certain members of the management team. These PSUs vest over a three-year period, subject to continued service, and are based on (1) the total shareholder return (TSR) of the Company’s common stock price compared to the S&P Healthcare Equipment Select Industry Index (the Index) over a two-year period or (2) specific revenue targets over a two-year performance period. Additionally, the grants from 2022 included PSUs that vest over a three-year period and are based on the attainment of specified stock prices. Since TSR and stock price attainment are considered market conditions, the PSUs based on TSR and stock price attainment have fair values that are determined at the grant date using the Monte Carlo simulation model, with the recorded expense based on fair value. Since revenue targets are considered performance conditions, the PSUs based on revenue targets have a fair value that is equal to the closing stock price on the grant date, with the recorded expense based on the fair value and the probability of achievement, which is reassessed at each reporting period. The PSU grant activity is as follows: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2023 Shares Weighted Average Fair Value Shares Weighted Average Fair Value Total shareholder return 12,499 $ 27.23 185,424 $ 43.89 Revenue targets 12,500 $ 20.11 185,451 $ 31.39 Total PSUs granted 24,999 $ 23.67 370,875 $ 37.64 Nine Months Ended September 30, 2022 Shares Weighted Average Fair Value Total shareholder return 71,364 $ 105.12 Revenue targets 71,378 $ 70.76 Stock price performance 250,000 $ 34.05 Total PSUs granted 392,742 $ 53.64 There were no PSU grants for the three months ended September 30, 2022. A summary of stock-based compensation expense by line items in the consolidated statements of operations is as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cost of revenue 657 637 1,769 1,873 Research and development 2,388 2,361 7,301 6,401 Sales, general and administrative 10,478 12,208 34,179 33,717 Total stock-based compensation expense 13,523 15,206 43,249 41,991 A summary of pre-tax stock-based compensation expense by category was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Stock Options — 499 539 1,621 Restricted stock units 10,776 10,251 34,423 27,541 Performance stock units 2,510 4,083 6,676 11,442 Employee stock purchase plan 237 373 1,611 1,387 Total stock-based compensation expense 13,523 15,206 43,249 41,991 |
Basic and Diluted Net Income (L
Basic and Diluted Net Income (Loss) Per Share | 9 Months Ended |
Sep. 30, 2023 | |
Earnings Per Share [Abstract] | |
Basic and Diluted Net Income (Loss) Per Share | 9. Basic and Diluted Net Income (Loss) Per Share Basic net loss per share is computed by dividing the net loss by the weighted average number of common shares outstanding for the period. Diluted net income (loss) per share is computed by dividing the net income (loss) by the weighted average number of common shares and dilutive common stock equivalents outstanding for the period, if inclusion of these is dilutive. The Company uses the if-converted method and presumes share settlement for its 2025 Notes when calculating the dilutive effect of these notes. In connection with the offerings of the convertible senior notes, the Company entered into convertible note hedges and warrants. However, the convertible note hedges are not included when calculating potentially dilutive shares since their effect is always anti-dilutive. Warrants were considered anti-dilutive to the extent that their strike price were above the Company's average share price during the period. The following table presents the reconciliation of net income (loss) used in computing basic and diluted net income (loss) per common share (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net income (loss) used in basic net income (loss) per $ ( 23,479 ) $ 81,508 $ ( 83,232 ) $ 22,193 Plus: — 1,305 — — Net income (loss) used in diluted net income (loss) per $ ( 23,479 ) $ 82,813 $ ( 83,232 ) $ 22,193 The following table presents the reconciliation of weighted average shares used in computing basic and diluted net income (loss) per common share: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Weighted average shares used to compute basic 36,142,255 35,402,086 35,882,826 35,265,193 Plus effect of dilutive securities: Stock-based awards from employee equity plans — 129,718 — 236,416 Convertible senior notes — 1,807,141 — — Weighted average shares used to compute 36,142,255 37,338,945 35,882,826 35,501,609 The following table presents the net income (loss) per common share - basic and diluted: Three Months Ended Nine Months Ended September 30, September 30, September 30, 2023 2022 2023 2022 Net income (loss) per common share: Basic $ ( 0.65 ) $ 2.30 $ ( 2.32 ) $ 0.63 Diluted $ ( 0.65 ) $ 2.22 $ ( 2.32 ) $ 0.63 The following potentially dilutive securities outstanding at the end of the periods presented have been excluded from the computation of diluted shares outstanding, as the effect would be anti-dilutive: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Unreleased restricted stock and performance stock units 2,795,332 1,083,509 2,795,332 939,869 Options to purchase common stock 386,518 418,509 386,518 371,193 Convertible senior notes 1,807,141 — 1,807,141 1,807,141 Warrants related to the issuance of convertible senior notes 1,807,141 1,807,141 1,807,141 1,807,141 Total 6,796,132 3,309,159 6,796,132 4,925,344 |
Employee Benefit Plans
Employee Benefit Plans | 9 Months Ended |
Sep. 30, 2023 | |
Postemployment Benefits [Abstract] | |
Employee Benefit Plans | 10. Employee Benefit Plans 401(k) Plan In 2007, the Company adopted a 401(k) plan for its employees whereby eligible employees may contribute up to the maximum amount permitted by the Internal Revenue Code. In June 2016, the Company adopted a policy to match a portion of employee contributions for all qualified employees participating in the 401(k) plan. The Company recorded an expense for matching contributions of $ 0.3 million and $ 0.4 million for the three months ended September 30, 2023 and 2022, respectively, and $ 3.4 million and $ 3.3 million for the nine months ended September 30, 2023 and 2022 , respectively. |
Summary of Significant Accoun_2
Summary of Significant Accounting Policies (Policies) | 9 Months Ended |
Sep. 30, 2023 | |
Accounting Policies [Abstract] | |
Basis of Presentation | Basis of Presentation The accompanying interim condensed consolidated financial statements as of September 30, 2023 and for the three and nine months ended September 30, 2023 and 2022, and the related interim information contained within the notes to the financial statements, are unaudited. The unaudited interim condensed consolidated financial statements (the condensed consolidated financial statements) have been prepared in accordance with generally accepted accounting principles in the United States (U.S. GAAP) for interim financial information and on the same basis as the audited financial statements included on the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (the Annual Report) filed with the Securities and Exchange Commission (SEC) on February 21, 2023. The condensed consolidated financial statements are prepared in U.S. dollars and include the Company’s accounts and those of its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments) necessary to state fairly the Company’s financial position as of September 30, 2023, the results of its operations for the three and nine months ended September 30, 2023 and 2022 and the consolidated statements of cash flows for the nine months ended September 30, 2023 and 2022. All such adjustments are of a normal and recurring nature. The interim financial data as of September 30, 2023 is not necessarily indicative of the results to be expected for the year ending December 31, 2023, or for any future period. The consolidated balance sheet as of December 31, 2022 was derived from the audited financials as of that date. The accompanying condensed consolidated financial statements and related financial information should be read in conjunction with the audited consolidated financial statements and the related notes thereto for the year ended December 31, 2022 included in the Annual Report. |
Use of Estimates | Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions believed to be reasonable by management. Actual results may differ from those estimates under different assumptions or conditions. |
Foreign Currency Translation | Foreign Currency Translation Unrealized foreign exchange gains and losses from the remeasurement of assets and liabilities denominated in currencies other than the functional currency of the reporting entity are recorded in other income (expense), net. Additionally, realized gains and losses resulting from transactions denominated in currencies other than the local currency are recorded in other income (expense), net in the condensed consolidated statements of operations and comprehensive loss. The Company recorded net unrealized and net realized foreign currency transaction gains (losses) during the periods presented as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net unrealized foreign currency gain (loss) $ 547 $ 1,026 $ 402 $ 2,249 Net realized foreign currency gain (loss) ( 259 ) ( 585 ) ( 396 ) ( 1,296 ) |
Significant Accounting Policies | Significant Accounting Policies There have been no material changes to the Company’s significant accounting policies from its Annual Report. |
Cash and Cash Equivalents | Cash and Cash Equivalents The Company considers all highly-liquid investments purchased with an original maturity of three months or less at the date of purchase to be cash equivalents. Cash and cash equivalents include money market funds in the amount of $ 46.3 million and $ 92.3 million as of September 30, 2023 and December 31, 2022, respectively. As of September 30, 2023 and December 31, 2022, the Company’s cash equivalents were held at institutions in the United States and include deposits in a money market fund which was unrestricted as to withdrawal or use. The Company also held cash in foreign banks of approximately $ 9.7 million at September 30, 2023 and $ 18.6 million at December 31, 2022 that was not insured. The Company has not experienced any losses on its deposits of cash and cash equivalents. |
Inventories | Inventories Inventories are stated at the lower of cost or net realizable value. Cost is determined using the standard cost method which approximates the first-in, first-out basis. Net realizable value is determined as the prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company regularly reviews inventory quantities compared to forecasted sales to record a provision for excess and obsolete inventory when appropriate. Inventory write-downs are recorded for excess and obsolete inventory. The Company estimates forecasted sales by considering product acceptance in the marketplace, customer demand, historical sales, product obsolescence and technological innovations. The Company periodically evaluates the carrying value of inventory on hand for potential excess amount over demand using the same lower of cost or net realizable value approach as that has been used to value the inventory. The Company also periodically evaluates inventory quantities in consideration of actual loss experience. As a result of these evaluations, the Company recognized total write-downs of $ 0.1 million and $ 1.4 million, for its inventories for the three months ended September 30, 2023 and 2022, respectively, and $ 3.0 million and $ 3.6 million for the nine months ended September 30, 2023 and 2022 , respectively. |
Summary of Significant Accoun_3
Summary of Significant Accounting Policies (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Accounting Policies [Abstract] | |
Net Unrealized and Net Realized Foreign Currency Transaction Gains (Losses) | The Company recorded net unrealized and net realized foreign currency transaction gains (losses) during the periods presented as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net unrealized foreign currency gain (loss) $ 547 $ 1,026 $ 402 $ 2,249 Net realized foreign currency gain (loss) ( 259 ) ( 585 ) ( 396 ) ( 1,296 ) |
Revenue (Tables)
Revenue (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Revenue from Contract with Customer [Abstract] | |
Summary of Revenue by Geography on Billing Address of Customer | The following table presents revenue by geography, based on the billing address of the customer (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 United States $ 89,760 $ 86,130 $ 265,042 $ 248,393 International 14,102 14,336 43,956 44,128 Total revenue $ 103,862 $ 100,466 $ 308,998 $ 292,521 |
Schedule of Revenue by Major Customers by Geographic Area | The United States is the only country that accounts for 10% or more of the revenue during the periods presented: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 United States 86 % 86 % 86 % 85 % |
Lease Accounting (Tables)
Lease Accounting (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Leases [Abstract] | |
Schedule of Weighted Average Lease Terms and Discounts Rates | The weighted average lease terms and discounts rates are as follows: September 30, 2023 December 31, 2022 Operating Lease Term and Discount Rate Weighted-average remaining lease term 2.89 years 3.38 years Weighted-average discount rate 7.0 % 7.0 % |
Schedule of Maturity of Lease Liabilities | As of September 30, 2023, the maturity of lease liabilities are as follows (in thousands): Operating Leases 2023, remaining months $ 1,523 2024 6,201 2025 2,849 2026 405 2027 417 Thereafter 1,561 Total lease payments 12,956 Less: Interest ( 1,264 ) Present value of lease liabilities $ 11,692 |
Supplemental Lease Cost Information | Supplemental lease cost information are as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Operating lease cost $ 1,342 $ 1,342 $ 4,027 $ 4,027 |
Schedule Of Operating Lease Assets and Liabilities | Supplemental balance sheet information are as follows (in thousands): September 30, 2023 December 31, 2022 Operating Leases: Operating lease assets $ 10,099 $ 13,430 Other current liabilities $ 5,587 $ 5,195 Long term operating lease liabilities 6,105 10,296 Total operating lease liabilities $ 11,692 $ 15,491 |
Schedule of Supplemental Cash Flow Information Related to Lease | Supplemental cash flow information are as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flow from operating leases $ 1,523 $ 1,478 $ 4,497 $ 4,242 |
Fair Value Measurements (Tables
Fair Value Measurements (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Fair Value Disclosures [Abstract] | |
Financial Instruments Measured at Fair Value on Recurring Basis | The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands): Balance as of September 30, 2023 Level 1 Level 2 Level 3 Total Assets: Money market funds (i) $ 46,264 $ — $ — $ 46,264 Agency bonds (ii) — 151,646 — 151,646 Commercial paper (ii) — 22,038 — 22,038 Corporate notes (ii) — 3,465 — 3,465 Treasury bonds (ii) 77,954 — — 77,954 Total assets $ 124,218 $ 177,149 $ — $ 301,367 Balance as of December 31, 2022 Level 1 Level 2 Level 3 Total Assets: Money market funds (i) $ 92,318 $ — $ — $ 92,318 Agency bonds (ii) — 183,678 — 183,678 Commercial paper (ii) — 24,742 — 24,742 Treasury bonds (ii) 45,592 — — 45,592 Total assets $ 137,910 $ 208,420 $ — $ 346,330 (i) Included in cash and cash equivalents on the condensed consolidated balance sheets. (ii) Included in short-term investments on the condensed consolidated balance sheets. |
Balance Sheet Components (Table
Balance Sheet Components (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
Summary of Gross Unrealized Gains and Unrealized Losses of Investment Securities Excluding Investments in Money Market Funds | The following is a summary of the gross unrealized gains and unrealized losses on the Company’s investment securities, excluding investments in money market funds (in thousands): September 30, 2023 Amortized Gross Gross Aggregate Investment Securities Agency bonds $ 152,025 $ — $ ( 379 ) $ 151,646 Commercial paper 22,054 — ( 16 ) 22,038 Corporate notes 3,469 — ( 4 ) 3,465 Treasury bonds 78,118 5 ( 169 ) 77,954 Total securities $ 255,666 $ 5 $ ( 568 ) $ 255,103 December 31, 2022 Amortized Gross Gross Aggregate Investment Securities Agency bonds $ 184,666 $ 2 $ ( 990 ) $ 183,678 Commercial paper 24,767 5 ( 30 ) 24,742 Treasury bonds 46,008 — ( 416 ) 45,592 Total securities $ 255,441 $ 7 $ ( 1,436 ) $ 254,012 |
Summary of Contractual Maturities of Investment Securities | The contractual maturities of the Company’s investment securities as of September 30, 2023 were as follows (in thousands): Amortized Cost Fair Value Amounts maturing within one year $ 208,118 $ 207,605 Amounts maturing after one year through five years 47,548 47,498 Total investment securities $ 255,666 $ 255,103 |
Components of Inventories | Inventories (in thousands) September 30, December 31, 2023 2022 Raw materials $ 65,239 $ 53,384 Work in process 1,411 1,195 Finished goods 55,770 45,059 Total inventories $ 122,420 $ 99,638 |
Schedule of Property and Equipment, Net and Depreciation and Amortization Expense | Property and Equipment, Net (in thousands) September 30, December 31, 2023 2022 Laboratory and manufacturing equipment $ 13,269 $ 11,482 Computer equipment and software 23,599 18,626 Furniture and fixtures 4,618 4,421 Leasehold improvements 10,856 10,589 Construction in process 5,455 5,984 Total 57,797 51,102 Less: Accumulated depreciation and amortization ( 33,766 ) ( 28,831 ) Property and equipment, net $ 24,031 $ 22,271 The Company recognized depreciation and amortization expense on property and equipment as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Depreciation and amortization expense $ 1,723 $ 1,602 $ 4,935 $ 4,658 |
Summary of Accrued Liabilities | Accrued Liabilities (in thousands) September 30, December 31, 2023 2022 Accrued payroll and related expenses $ 30,546 $ 35,341 Accrued professional fees 2,819 1,425 Accrued taxes 1,617 1,910 Accrued clinical and research expenses 497 282 Accrued interest 2,609 1,305 Accrued warranty 1,477 866 Accrued other 5,737 6,039 Total accrued liabilities $ 45,302 $ 47,168 |
Commitments and Contingencies (
Commitments and Contingencies (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Commitments and Contingencies Disclosure [Abstract] | |
Schedule of Activities Related to Warranty Obligations | Activities related to warranty obligations were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Beginning balance $ 1,349 $ 636 $ 866 $ 664 Provision for warranty 1,051 822 3,899 2,325 Utilization ( 923 ) ( 707 ) ( 3,288 ) ( 2,238 ) Ending balance $ 1,477 $ 751 $ 1,477 $ 751 |
Debt (Tables)
Debt (Tables) - 2025 Notes and Convertible Notes [Member] | 9 Months Ended |
Sep. 30, 2023 | |
Debt Instrument [Line Items] | |
Interest Expense Recognized Related to Convertible Notes | The following table sets forth the interest expense recognized related to the 2025 Notes (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Contractual interest expense $ 1,305 $ 1,305 $ 3,914 $ 3,914 Amortization of debt issuance costs 313 303 935 904 Total interest expense $ 1,618 $ 1,608 $ 4,849 $ 4,818 |
Debt, Liability Component [Member] | |
Debt Instrument [Line Items] | |
Net Carrying Amount of Convertible Debt | The net carrying amount of the liability component of the 2025 Notes was as follows (in thousands): September 30, December 31, 2023 2022 Principal $ 189,750 $ 189,750 Unamortized issuance cost ( 1,947 ) ( 2,883 ) Net carrying amount $ 187,803 $ 186,867 |
Stock-Based Compensation (Table
Stock-Based Compensation (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | |
Summary of Stock-Based Compensation Expense by Line Items in Consolidated Statements of Operations | A summary of stock-based compensation expense by line items in the consolidated statements of operations is as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Cost of revenue 657 637 1,769 1,873 Research and development 2,388 2,361 7,301 6,401 Sales, general and administrative 10,478 12,208 34,179 33,717 Total stock-based compensation expense 13,523 15,206 43,249 41,991 |
Summary of Stock-Based Compensation Expense | A summary of pre-tax stock-based compensation expense by category was as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Stock Options — 499 539 1,621 Restricted stock units 10,776 10,251 34,423 27,541 Performance stock units 2,510 4,083 6,676 11,442 Employee stock purchase plan 237 373 1,611 1,387 Total stock-based compensation expense 13,523 15,206 43,249 41,991 |
Performance Stock Units [Member] | |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | |
Schedule of PSU Grant Activity | The PSU grant activity is as follows: Three Months Ended Nine Months Ended September 30, 2023 September 30, 2023 Shares Weighted Average Fair Value Shares Weighted Average Fair Value Total shareholder return 12,499 $ 27.23 185,424 $ 43.89 Revenue targets 12,500 $ 20.11 185,451 $ 31.39 Total PSUs granted 24,999 $ 23.67 370,875 $ 37.64 Nine Months Ended September 30, 2022 Shares Weighted Average Fair Value Total shareholder return 71,364 $ 105.12 Revenue targets 71,378 $ 70.76 Stock price performance 250,000 $ 34.05 Total PSUs granted 392,742 $ 53.64 |
Basic and Diluted Net Income _2
Basic and Diluted Net Income (Loss) Per Share (Tables) | 9 Months Ended |
Sep. 30, 2023 | |
Earnings Per Share [Abstract] | |
Computation of Basic and Diluted Net Income (Loss) Per Common Share | The following table presents the reconciliation of net income (loss) used in computing basic and diluted net income (loss) per common share (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Net income (loss) used in basic net income (loss) per $ ( 23,479 ) $ 81,508 $ ( 83,232 ) $ 22,193 Plus: — 1,305 — — Net income (loss) used in diluted net income (loss) per $ ( 23,479 ) $ 82,813 $ ( 83,232 ) $ 22,193 |
Schedule of Weighted Average Shares used in Computing Basic and Diluted Net Income (Loss) Per Common Share | The following table presents the reconciliation of weighted average shares used in computing basic and diluted net income (loss) per common share: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Weighted average shares used to compute basic 36,142,255 35,402,086 35,882,826 35,265,193 Plus effect of dilutive securities: Stock-based awards from employee equity plans — 129,718 — 236,416 Convertible senior notes — 1,807,141 — — Weighted average shares used to compute 36,142,255 37,338,945 35,882,826 35,501,609 |
Schedule of Net Income (Loss) Per Common Share - Basic and Diluted | The following table presents the net income (loss) per common share - basic and diluted: Three Months Ended Nine Months Ended September 30, September 30, September 30, 2023 2022 2023 2022 Net income (loss) per common share: Basic $ ( 0.65 ) $ 2.30 $ ( 2.32 ) $ 0.63 Diluted $ ( 0.65 ) $ 2.22 $ ( 2.32 ) $ 0.63 |
Computation of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Shares | The following potentially dilutive securities outstanding at the end of the periods presented have been excluded from the computation of diluted shares outstanding, as the effect would be anti-dilutive: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Unreleased restricted stock and performance stock units 2,795,332 1,083,509 2,795,332 939,869 Options to purchase common stock 386,518 418,509 386,518 371,193 Convertible senior notes 1,807,141 — 1,807,141 1,807,141 Warrants related to the issuance of convertible senior notes 1,807,141 1,807,141 1,807,141 1,807,141 Total 6,796,132 3,309,159 6,796,132 4,925,344 |
Summary of Significant Accoun_4
Summary of Significant Accounting Policies - Net Unrealized and Net Realized Foreign Currency Transaction Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Accounting Policies [Abstract] | ||||
Net unrealized foreign currency gain (loss) | $ 547 | $ 1,026 | $ 402 | $ 2,249 |
Net realized foreign currency gain (loss) | $ (259) | $ (585) | $ (396) | $ (1,296) |
Revenue - Summary of Revenue by
Revenue - Summary of Revenue by Geography on Billing Address of Customer (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Disaggregation Of Revenue [Line Items] | ||||
Total revenue | $ 103,862 | $ 100,466 | $ 308,998 | $ 292,521 |
United States [Member] | ||||
Disaggregation Of Revenue [Line Items] | ||||
Total revenue | 89,760 | 86,130 | 265,042 | 248,393 |
International [Member] | ||||
Disaggregation Of Revenue [Line Items] | ||||
Total revenue | $ 14,102 | $ 14,336 | $ 43,956 | $ 44,128 |
Revenue - Schedule of Revenue b
Revenue - Schedule of Revenue by Major Customers by Geographic Area (Detail) | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | United States [Member] | ||||
Concentration Risk [Line Items] | ||||
Revenue | 86% | 86% | 86% | 85% |
Revenue - Additional Informatio
Revenue - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended | ||
Sep. 30, 2023 USD ($) Customer | Sep. 30, 2022 USD ($) Customer | Sep. 30, 2023 USD ($) Customer | Sep. 30, 2022 USD ($) Customer | Dec. 31, 2022 Customer | |
Disaggregation Of Revenue [Line Items] | |||||
Bad debt expenses | $ 0 | $ 400,000 | $ 200,000 | ||
Bad debt credits | $ 7,000 | ||||
Revenue | 103,862,000 | 100,466,000 | 308,998,000 | 292,521,000 | |
Painful Diabetic Neuropathy [Member] | |||||
Disaggregation Of Revenue [Line Items] | |||||
Revenue | $ 20,800,000 | $ 13,400,000 | $ 55,500,000 | $ 30,400,000 | |
Percentage of permanent implant procedures | 20% | 13% | 18% | 11% | |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Major Customers [Member] | |||||
Disaggregation Of Revenue [Line Items] | |||||
Concentration risk, percentage | 10% | 10% | 10% | 10% | |
Number of customers accounted 10% or more concentration risk | Customer | 0 | 0 | 0 | 0 | |
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Major Customers [Member] | |||||
Disaggregation Of Revenue [Line Items] | |||||
Concentration risk, percentage | 10% | 10% | |||
Number of customers accounted 10% or more concentration risk | Customer | 0 | 0 |
Lease Accounting - Schedule of
Lease Accounting - Schedule of Weighted Average Lease Terms and Discounts Rates (Detail) | Sep. 30, 2023 | Dec. 31, 2022 |
Leases [Abstract] | ||
Weighted-average remaining lease term | 2 years 10 months 20 days | 3 years 4 months 17 days |
Weighted-average discount rate | 7% | 7% |
Lease Accounting - Schedule o_2
Lease Accounting - Schedule of Maturity of Lease Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Leases [Abstract] | ||
2023, remaining months | $ 1,523 | |
2024 | 6,201 | |
2025 | 2,849 | |
2026 | 405 | |
2027 | 417 | |
Thereafter | 1,561 | |
Total lease payments | 12,956 | |
Less: Interest | (1,264) | |
Present value of lease liabilities | $ 11,692 | $ 15,491 |
Lease Accounting - Supplemental
Lease Accounting - Supplemental Lease Cost Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Leases [Abstract] | ||||
Operating lease cost | $ 1,342 | $ 1,342 | $ 4,027 | $ 4,027 |
Lease Accounting - Summary of O
Lease Accounting - Summary of Operating Lease Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Operating Leases: | ||
Operating lease assets | $ 10,099 | $ 13,430 |
Other current liabilities | $ 5,587 | $ 5,195 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities |
Long term operating lease liabilities | $ 6,105 | $ 10,296 |
Total operating lease liabilities | $ 11,692 | $ 15,491 |
Lease Accounting - Schedule o_3
Lease Accounting - Schedule of Supplemental Cash Flow Information Related to Lease (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Cash paid for amounts included in the measurement of lease liabilities: | ||||
Operating cash flow from operating leases | $ 1,523 | $ 1,478 | $ 4,497 | $ 4,242 |
Fair Value Measurements - Finan
Fair Value Measurements - Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - Fair Value Measurements Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | $ 301,367 | $ 346,330 | |
Level 1 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | 124,218 | 137,910 | |
Level 2 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | 177,149 | 208,420 | |
Money Market Funds [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [1] | 46,264 | 92,318 |
Money Market Funds [Member] | Level 1 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [1] | 46,264 | 92,318 |
Agency Bonds [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 151,646 | 183,678 |
Agency Bonds [Member] | Level 2 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 151,646 | 183,678 |
Commercial Paper [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 22,038 | 24,742 |
Commercial Paper [Member] | Level 2 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 22,038 | 24,742 |
Corporate Notes [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 3,465 | |
Corporate Notes [Member] | Level 2 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 3,465 | |
Treasury Bonds [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | 77,954 | 45,592 |
Treasury Bonds [Member] | Level 1 [Member] | |||
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
Total assets | [2] | $ 77,954 | $ 45,592 |
[1] Included in cash and cash equivalents on the condensed consolidated balance sheets. Included in short-term investments on the condensed consolidated balance sheets. |
Fair Value Measurements - Addit
Fair Value Measurements - Additional Information (Detail) - 2.75% Convertible Senior Notes due 2025 [Member] - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
Sep. 30, 2023 | Dec. 31, 2022 | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Debt instrument, interest rate | 2.75% | 2.75% |
Debt instrument due year | 2025 | 2025 |
Fair Value of Notes | $ 179.4 | $ 174.2 |
Balance Sheet Components - Addi
Balance Sheet Components - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | |||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | |
Investments, Debt and Equity Securities [Abstract] | |||||
Money market funds | $ 46.3 | $ 46.3 | $ 92.3 | ||
Cash held in foreign banks | 9.7 | 9.7 | $ 18.6 | ||
Write down of inventory | $ 0.1 | $ 1.4 | $ 3 | $ 3.6 |
Balance Sheet Components - Summ
Balance Sheet Components - Summary of Gross Unrealized Gains and Unrealized Losses of Investment Securities Excluding Investments in Money Market Funds (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | $ 255,666 | $ 255,441 |
Gross Unrealized Holding Gains | 5 | 7 |
Gross Unrealized Holding Losses | (568) | (1,436) |
Aggregate Fair Value | 255,103 | 254,012 |
Agency Bonds [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 152,025 | 184,666 |
Gross Unrealized Holding Gains | 2 | |
Gross Unrealized Holding Losses | (379) | (990) |
Aggregate Fair Value | 151,646 | 183,678 |
Commercial Paper [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 22,054 | 24,767 |
Gross Unrealized Holding Gains | 5 | |
Gross Unrealized Holding Losses | (16) | (30) |
Aggregate Fair Value | 22,038 | 24,742 |
Corporate Notes [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 3,469 | |
Gross Unrealized Holding Losses | (4) | |
Aggregate Fair Value | 3,465 | |
Treasury Bonds [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 78,118 | 46,008 |
Gross Unrealized Holding Gains | 5 | |
Gross Unrealized Holding Losses | (169) | (416) |
Aggregate Fair Value | $ 77,954 | $ 45,592 |
Balance Sheet Components - Su_2
Balance Sheet Components - Summary of Contractual Maturities of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Investments, Debt and Equity Securities [Abstract] | ||
Amortized Cost, Amounts maturing within one year | $ 208,118 | |
Amortized Cost, Amounts maturing after one year through five years | 47,548 | |
Amortized Cost | 255,666 | $ 255,441 |
Fair Value, Amounts maturing within one year | 207,605 | |
Fair Value, Amounts maturing after one year through five years | 47,498 | |
Fair Value, Total investment securities | $ 255,103 | $ 254,012 |
Balance Sheet Components - Comp
Balance Sheet Components - Components of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Inventory Disclosure [Abstract] | ||
Raw materials | $ 65,239 | $ 53,384 |
Work in porcess | 1,411 | 1,195 |
Finished goods | 55,770 | 45,059 |
Total inventories | $ 122,420 | $ 99,638 |
Balance Sheet Components - Sche
Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | $ 57,797 | $ 51,102 |
Less: Accumulated depreciation and amortization | (33,766) | (28,831) |
Property and equipment, net | 24,031 | 22,271 |
Laboratory and Manufacturing Equipment [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 13,269 | 11,482 |
Computer Equipment and Software [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 23,599 | 18,626 |
Furniture and Fixtures [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 4,618 | 4,421 |
Leasehold Improvements [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | 10,856 | 10,589 |
Construction in Process [Member] | ||
Property, Plant and Equipment [Line Items] | ||
Property and equipment, gross | $ 5,455 | $ 5,984 |
Balance Sheet Components - Sc_2
Balance Sheet Components - Schedule of Property and Equipment, Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Property, Plant and Equipment [Abstract] | ||||
Depreciation and amortization expense | $ 1,723 | $ 1,602 | $ 4,935 | $ 4,658 |
Balance Sheet Components - Su_3
Balance Sheet Components - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 |
Payables and Accruals [Abstract] | ||||||
Accrued payroll and related expenses | $ 30,546 | $ 35,341 | ||||
Accrued professional fees | 2,819 | 1,425 | ||||
Accrued taxes | 1,617 | 1,910 | ||||
Accrued clinical and research expenses | 497 | 282 | ||||
Accrued interest | 2,609 | 1,305 | ||||
Accrued warranty | 1,477 | $ 1,349 | 866 | $ 751 | $ 636 | $ 664 |
Accrued other | 5,737 | 6,039 | ||||
Total accrued liabilities | $ 45,302 | $ 47,168 |
Commitments and Contingencies -
Commitments and Contingencies - Additional Information (Detail) $ in Millions | 1 Months Ended | 9 Months Ended | ||||
Oct. 31, 2021 USD ($) | Aug. 31, 2020 USD ($) ft² | Dec. 31, 2016 USD ($) ft² | Mar. 31, 2015 USD ($) ft² | Sep. 30, 2023 USD ($) ConvertibleNote | Apr. 30, 2021 USD ($) | |
Other Commitments [Line Items] | ||||||
Additional operating lease assets | $ 2.9 | |||||
Additional operating lease liabilities | $ 2.9 | |||||
Standard product warranty, description | limited one- to five-year warranty | |||||
Contingent consideration payment secured by convertible notes | $ 1.9 | |||||
Number of secured convertible notes | ConvertibleNote | 2 | |||||
Contingent consideration milestone obligation for additional funding secured by convertible notes | $ 1 | |||||
Amount of shares of senior security to be purchased | 2 | |||||
Costa Rica [Member] | ||||||
Other Commitments [Line Items] | ||||||
Lease agreement, commencement period | 2020-08 | |||||
Area of office space | ft² | 35,411 | |||||
Lease agreement, effective month and year | 2021-04 | |||||
Lease agreement, expiration period | 2031-06 | |||||
Lease agreement, lease expense | $ 3.9 | |||||
Other Assets [Member] | ||||||
Other Commitments [Line Items] | ||||||
Value of secured convertible notes | $ 1.9 | |||||
Redwood Office Agreement [Member] | ||||||
Other Commitments [Line Items] | ||||||
Lease agreement, commencement period | 2015-03 | |||||
Area of office space | ft² | 50,000 | |||||
Lease agreement, effective date | Jun. 30, 2015 | |||||
Lease agreement, expiration period | 2022-05 | |||||
Lease expense, payment due | $ 2 | |||||
Annual lease expense payable in final year of lease term | $ 2.4 | |||||
Redwood Office Agreement Additional Expansion Premises [Member] | Amendment 1 [Member] | ||||||
Other Commitments [Line Items] | ||||||
Area of office space | ft² | 50,000 | |||||
Lease expense, payment due | $ 1.2 | |||||
Annual lease expense payable in final year of lease term | $ 2.9 | |||||
Commencement date description | The lease for the Expansion Premises commenced on June 1, 2018 | |||||
Lease commencement date | Jun. 01, 2018 | |||||
Lease agreement, expiration date | May 31, 2025 | |||||
Non-cancellable Facility Lease [Member] | ||||||
Other Commitments [Line Items] | ||||||
Lease agreement, effective date | Mar. 01, 2017 | |||||
Lease agreement, expiration date | Feb. 28, 2022 | |||||
Lease agreement, lease expense | $ 0.4 | |||||
Non-cancellable Facility Lease [Member] | Amendment 1 [Member] | ||||||
Other Commitments [Line Items] | ||||||
Lease agreement, expiration date | May 31, 2025 | |||||
Lease agreement, lease expense | $ 0.4 |
Commitments and Contingencies_2
Commitments and Contingencies - Schedule of Activities Related to Warranty Obligations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Commitments and Contingencies Disclosure [Abstract] | ||||
Beginning balance | $ 1,349 | $ 636 | $ 866 | $ 664 |
Provision for warranty | 1,051 | 822 | 3,899 | 2,325 |
Utilization | (923) | (707) | (3,288) | (2,238) |
Ending balance | $ 1,477 | $ 751 | $ 1,477 | $ 751 |
Debt - Additional Information (
Debt - Additional Information (Detail) | 9 Months Ended |
Sep. 30, 2023 USD ($) | |
2025 Notes and Convertible Notes [Member] | |
Debt Instrument [Line Items] | |
Converted Value in Excess of Principal | $ 0 |
Debt - Net Carrying Amount of L
Debt - Net Carrying Amount of Liability Component of Convertible Debt (Detail) - 2025 Notes and Convertible Notes [Member] - Debt, Liability Component [Member] - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 |
Debt Instrument [Line Items] | ||
Principal | $ 189,750 | $ 189,750 |
Unamortized issuance cost | (1,947) | (2,883) |
Net carrying amount | $ 187,803 | $ 186,867 |
Debt - Interest Expense Recogni
Debt - Interest Expense Recognized Related to Convertible Notes (Detail) - 2025 Notes and Convertible Notes [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Debt Instrument [Line Items] | ||||
Contractual interest expense | $ 1,305 | $ 1,305 | $ 3,914 | $ 3,914 |
Amortization of debt issuance costs | 313 | 303 | 935 | 904 |
Total interest expense | $ 1,618 | $ 1,608 | $ 4,849 | $ 4,818 |
Stock-Based Compensation - Sche
Stock-Based Compensation - Schedule of PSU Grant Activity (Details) - Performance Stock Units [Member] - $ / shares | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
Shares | 24,999 | 0 | 370,875 | 392,742 |
Weighted Average Fair Value | $ 23.67 | $ 37.64 | $ 53.64 | |
Total Shareholder Return [Member] | ||||
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
Shares | 12,499 | 185,424 | 71,364 | |
Weighted Average Fair Value | $ 27.23 | $ 43.89 | $ 105.12 | |
Revenue Targets [Member] | ||||
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
Shares | 12,500 | 185,451 | 71,378 | |
Weighted Average Fair Value | $ 20.11 | $ 31.39 | $ 70.76 | |
Stock Price Performance [Member] | ||||
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||||
Shares | 250,000 | |||
Weighted Average Fair Value | $ 34.05 |
Stock-Based Compensation - Addi
Stock-Based Compensation - Additional Information (Details) - Performance Stock Units [Member] - shares | 3 Months Ended | 6 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | |||||
Number of restricted stock units granted | 24,999 | 0 | 370,875 | 392,742 | |
Management Team [Member] | |||||
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | |||||
Vesting period | 3 years | 3 years | |||
Targeted composite index period | 2 years | ||||
Revenue targets performance period | 2 years |
Stock-Based Compensation - Summ
Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Line Items in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | $ 13,523 | $ 15,206 | $ 43,249 | $ 41,991 |
Cost of Revenue [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | 657 | 637 | 1,769 | 1,873 |
Research and Development [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | 2,388 | 2,361 | 7,301 | 6,401 |
Selling, General and Administrative [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | $ 10,478 | $ 12,208 | $ 34,179 | $ 33,717 |
Stock-Based Compensation - Su_2
Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | $ 13,523 | $ 15,206 | $ 43,249 | $ 41,991 |
Stock Options [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | 0 | 499 | 539 | 1,621 |
Restricted Stock Units [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | 10,776 | 10,251 | 34,423 | 27,541 |
Performance Stock Units [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | 2,510 | 4,083 | 6,676 | 11,442 |
Employee Stock Purchase Plan [Member] | ||||
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
Stock-based compensation expense | $ 237 | $ 373 | $ 1,611 | $ 1,387 |
Basic and Diluted Net Income _3
Basic and Diluted Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Common Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Earnings Per Share [Abstract] | ||||
Net income (loss) used in basic net income (loss) per common share | $ (23,479) | $ 81,508 | $ (83,232) | $ 22,193 |
Plus: Assumed conversions of dilutive convertible notes | 0 | 1,305 | 0 | 0 |
Net income (loss) used in diluted net income (loss) per common share | $ (23,479) | $ 82,813 | $ (83,232) | $ 22,193 |
Basic and Diluted Net Income _4
Basic and Diluted Net Income (Loss) Per Share - Schedule of Weighted Average Shares used in Computing Basic and Diluted Net Income (Loss) Per Common Share (Details) - shares | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Earnings Per Share [Abstract] | ||||
Weighted average shares used to compute basic net income (loss) per share | 36,142,255 | 35,402,086 | 35,882,826 | 35,265,193 |
Plus effect of dilutive securities: | ||||
Stock-based awards from employee equity plans | 0 | 129,718 | 0 | 236,416 |
Convertible senior notes | 0 | 1,807,141 | 0 | 0 |
Weighted average shares used to compute diluted net income (loss) per share | 36,142,255 | 37,338,945 | 35,882,826 | 35,501,609 |
Basic and Diluted Net Income _5
Basic and Diluted Net Income (Loss) Per Share - Schedule of Net Income (Loss) Per Common Share - Basic and Diluted (Details) - $ / shares | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Earnings Per Share [Abstract] | ||||
Net income (loss) per share, Basic | $ (0.65) | $ 2.3 | $ (2.32) | $ 0.63 |
Net income (loss) per share, Diluted | $ (0.65) | $ 2.22 | $ (2.32) | $ 0.63 |
Basic and Diluted Net Income _6
Basic and Diluted Net Income (Loss) Per Share - Computation of Potentially Dilutive Securities Outstanding Excluded from Computation of Diluted Shares (Detail) - shares | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Potentially dilutive securities excluded from computation of diluted shares outstanding | 6,796,132 | 3,309,159 | 6,796,132 | 4,925,344 |
Unreleased Restricted Stock and Performance Stock Units [Member] | ||||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Potentially dilutive securities excluded from computation of diluted shares outstanding | 2,795,332 | 1,083,509 | 2,795,332 | 939,869 |
Employee Stock Option [Member] | ||||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Potentially dilutive securities excluded from computation of diluted shares outstanding | 386,518 | 418,509 | 386,518 | 371,193 |
Convertible Senior Notes [Member] | ||||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Potentially dilutive securities excluded from computation of diluted shares outstanding | 1,807,141 | 0 | 1,807,141 | 1,807,141 |
Warrants Related to the Issuance of Convertible Senior Notes [Member] | ||||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
Potentially dilutive securities excluded from computation of diluted shares outstanding | 1,807,141 | 1,807,141 | 1,807,141 | 1,807,141 |
Employee Benefit Plans - Additi
Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Expense for matching contributions | $ 0.3 | $ 0.4 | $ 3.4 | $ 3.3 |