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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  | 67,431,000 |  |  |
Beginning balance at Dec. 31, 2022 | $ 172,354 | $ 106 | $ 412,708 | $ (55) | $ (240,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (27,442) |  |  |  | (27,442)
Foreign currency translation gain (loss) | 31 |  |  | 31 |
Actuarial loss on pension liability adjustment | 0 |  |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares) |  | 1,415,000 |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding | (1,675) | $ 1 | (1,676) |  |
Stock-based compensation | 18,811 |  | 18,811 |  |
Issuance of common stock for 401K match (in shares) |  | 777,000 |  |  |
Issuance of common stock for 401K match | 1,942 | $ 1 | 1,941 |  |
Ending balance (in shares) at Sep. 30, 2023 |  | 69,623,000 |  |  |
Ending balance at Sep. 30, 2023 | 164,021 | $ 108 | 431,784 | (24) | (267,847)
Beginning balance (in shares) at Jun. 30, 2023 |  | 69,467,000 |  |  |
Beginning balance at Jun. 30, 2023 | 167,536 | $ 108 | 426,656 | (53) | (259,175)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (8,672) |  |  |  | (8,672)
Foreign currency translation gain (loss) | 29 |  |  | 29 |
Actuarial loss on pension liability adjustment | 0 |  |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares) |  | 156,000 |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding | (90) |  | (90) |  |
Stock-based compensation | 5,218 |  | 5,218 |  |
Ending balance (in shares) at Sep. 30, 2023 |  | 69,623,000 |  |  |
Ending balance at Sep. 30, 2023 | $ 164,021 | $ 108 | 431,784 | (24) | (267,847)
Beginning balance (in shares) at Dec. 31, 2023 | 70,239,890 | 70,240,000 |  |  |
Beginning balance at Dec. 31, 2023 | $ 159,003 | $ 109 | 433,781 | (60) | (274,827)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (43,190) |  |  |  | (43,190)
Foreign currency translation gain (loss) | (34) |  |  | (34) |
Actuarial loss on pension liability adjustment | (30) |  |  | (30) |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares) |  | 1,687,000 |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding | (457) | $ 2 | (459) |  |
Stock-based compensation | $ 12,424 |  | 12,424 |  |
Issuance of common stock upon exercise of stock options (in shares) | 83,000 | 83,000 |  |  |
Issuance of common stock upon exercise of stock options | $ 149 |  | 149 |  |
Issuance of common stock for 401K match (in shares) |  | 370,000 |  |  |
Issuance of common stock for 401K match | $ 1,618 |  | 1,618 |  |
Ending balance (in shares) at Sep. 30, 2024 | 72,380,609 | 72,380,000 |  |  |
Ending balance at Sep. 30, 2024 | $ 129,483 | $ 111 | 447,513 | (124) | (318,017)
Beginning balance (in shares) at Jun. 30, 2024 |  | 72,223,000 |  |  |
Beginning balance at Jun. 30, 2024 | 149,149 | $ 111 | 439,146 | (146) | (289,962)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net loss | (28,055) |  |  |  | (28,055)
Foreign currency translation gain (loss) | 22 |  |  | 22 |
Actuarial loss on pension liability adjustment | 0 |  |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding (in shares) |  | 132,000 |  |  |
Restricted stock unit awards vested, net of shares withheld to cover tax withholding | (28) |  | (28) |  |
Stock-based compensation | 8,350 |  | 8,350 |  |
Issuance of common stock upon exercise of stock options (in shares) |  | 25,000 |  |  |
Issuance of common stock upon exercise of stock options | $ 45 |  | 45 |  |
Ending balance (in shares) at Sep. 30, 2024 | 72,380,609 | 72,380,000 |  |  |
Ending balance at Sep. 30, 2024 | $ 129,483 | $ 111 | $ 447,513 | $ (124) | $ (318,017)

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