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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2022 |  | 121,667,250 |  |  |
Beginning balance at Dec. 31, 2022 | $ 74,051 | $ 122 | $ 450,786 | $ (119) | $ (376,738)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Vesting of restricted stock units |  | 540,238 |  |  |
Vesting of restricted stock units | 0 |  |  |  |
Stock-based compensation expense | 1,645 |  | 1,645 |  |
Net loss | (24,020) |  |  |  | (24,020)
Ending balance, shares at Mar. 31, 2023 |  | 122,207,488 |  |  |
Ending balance at Mar. 31, 2023 | 51,676 | $ 122 | 452,431 | (119) | (400,758)
Beginning balance, shares at Dec. 31, 2023 |  | 167,434,595 |  |  |
Beginning balance at Dec. 31, 2023 | 51,099 | $ 167 | 528,956 | (119) | (477,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Vesting of restricted stock units (in shares) |  | 503,186 |  |  |
Vesting of restricted stock units |  | $ 1 |  |  |
Vesting of restricted stock units | 0 |  | (1) |  |
Stock-based compensation expense | 1,739 |  | 1,739 |  |
Unrealized loss on marketable securities | (36) |  |  | (36) |
Net loss | (51,766) |  |  |  | (51,766)
Ending balance, shares at Mar. 31, 2024 |  | 167,937,781 |  |  |
Ending balance at Mar. 31, 2024 | $ 1,036 | $ 168 | $ 530,694 | $ (155) | $ (529,671)

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