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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Preferred Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Gain (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Common stock, Beginning balance (in shares) at Dec. 31, 2021 |  | 150,082,000 |  |  |  |  |
Beginning balance at Dec. 31, 2021 | $ 113,595 | $ 150 | $ 0 | $ 1,608,749 | $ (1,487,776) | $ (10) | $ (7,518)
Preferred stock beginning balance (in shares) at Dec. 31, 2021 |  |  | 0 |  |  |  |
Stock-based compensation | 11,520 |  |  | 11,520 |  |  |
Issuance of equity-classified warrants | 1,030 |  |  | 1,030 |  |  |
Issuance of treasury stock | 0 |  |  | (6,321) |  |  | 6,321
Issuance of common stock under Equity Incentive Plans (in shares) |  | 32,000 |  |  |  |  |
Repurchase of common stock | (864) |  |  |  |  |  | (864)
Issuance of stock, net of fees (in shares) |  | 39,100,000 |  |  |  |  |
Issuance of stock, net of fees | 94,205 | $ 39 |  | 94,166 |  |  |
Net loss | (101,944) |  |  |  | (101,944) |  |
Unrealized gain (loss) on investments | (418) |  |  |  |  | (418) |
Common stock, Ending balance (in shares) at Dec. 31, 2022 |  | 189,214,000 |  |  |  |  |
Preferred stock ending balance (in shares) at Dec. 31, 2022 |  |  | 0 |  |  |  |
Ending balance at Dec. 31, 2022 | 117,124 | $ 189 | $ 0 | 1,709,144 | (1,589,720) | (428) | (2,061)
Stock-based compensation | 14,340 |  |  | 14,340 |  |  |
Issuance of equity-classified warrants | 307 |  |  | 307 |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) |  | 1,291,000 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | 0 | $ 1 |  | (1) |  |  |
Repurchase of common stock | (824) |  |  |  |  |  | (824)
Issuance of stock, net of fees (in shares) |  | 55,288,000 |  |  |  |  |
Issuance of stock, net of fees | 138,823 | $ 55 |  | 138,768 |  |  |
Net loss | (177,119) |  |  |  | (177,119) |  |
Unrealized gain (loss) on investments | $ 459 |  |  |  |  | 459 |
Common stock, Ending balance (in shares) at Dec. 31, 2023 | 245,792,668 | 245,793,000 |  |  |  |  |
Preferred stock ending balance (in shares) at Dec. 31, 2023 | 0 |  | 0 |  |  |  |
Ending balance at Dec. 31, 2023 | $ 93,110 | $ 245 | $ 0 | 1,862,558 | (1,766,839) | 31 | (2,885)
Stock-based compensation | 13,499 |  |  | 13,499 |  |  |
Issuance of equity-classified warrants | 0 |  |  |  |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) |  | 2,020,000 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | 64 | $ 3 |  | 61 |  |  |
Repurchase of common stock | (1,730) |  |  |  |  |  | (1,730)
Issuance of stock, net of fees (in shares) |  |  | 2,304,000 |  |  |  |
Issuance of stock, net of fees | 241,322 |  | $ 23 | 241,299 |  |  |
Conversion of preferred stock to common stock (in shares) |  | 115,207,000 | (2,304,000) |  |  |  |
Conversion of preferred stock to common stock | 0 | $ 115 | $ (23) | (92) |  |  |
Net loss | (200,403) |  |  |  | (200,403) |  |
Unrealized gain (loss) on investments | $ 88 |  |  |  |  | 88 |
Common stock, Ending balance (in shares) at Dec. 31, 2024 | 363,020,303 | 363,020,000 |  |  |  |  |
Preferred stock ending balance (in shares) at Dec. 31, 2024 | 2,304,147 |  | 0 |  |  |  |
Ending balance at Dec. 31, 2024 | $ 145,950 | $ 363 | $ 0 | $ 2,117,325 | $ (1,967,242) | $ 119 | $ (4,615)

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