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Condensed 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, 2022 |  | 189,214,000 |  |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 117,124 | $ 189 | $ 0 | $ 1,709,144 | $ (1,589,720) | $ (428) | $ (2,061)
Preferred stock beginning balance (in shares) at Dec. 31, 2022 |  |  | 0 |  |  |  |
Stock-based compensation | 3,415 |  |  | 3,415 |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) |  | 1,216,000 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | 0 | $ 1 |  | (1) |  |  |
Repurchase of common stock | (824) |  |  |  |  |  | (824)
Net loss | (31,934) |  |  |  | (31,934) |  |
Unrealized gain (loss) on investments | 265 |  |  |  |  | 265 |
Common stock ending balance (in shares) at Mar. 31, 2023 |  | 190,430,000 |  |  |  |  |
Ending balance at Mar. 31, 2023 | 88,046 | $ 190 | $ 0 | 1,712,558 | (1,621,654) | (163) | (2,885)
Preferred stock ending balance (in shares) at Mar. 31, 2023 |  |  | 0 |  |  |  |
Common stock beginning balance (in shares) at Dec. 31, 2022 |  | 189,214,000 |  |  |  |  |
Beginning balance at Dec. 31, 2022 | 117,124 | $ 189 | $ 0 | 1,709,144 | (1,589,720) | (428) | (2,061)
Preferred stock beginning balance (in shares) at Dec. 31, 2022 |  |  | 0 |  |  |  |
Issuance of equity-classified warrants | 307 |  |  |  |  |  |
Net loss | (127,363) |  |  |  |  |  |
Unrealized gain (loss) on investments | 315 |  |  |  |  |  |
Common stock ending balance (in shares) at Sep. 30, 2023 |  | 245,793,000 |  |  |  |  |
Ending balance at Sep. 30, 2023 | 139,510 | $ 245 | $ 0 | 1,859,346 | (1,717,083) | (113) | (2,885)
Preferred stock ending balance (in shares) at Sep. 30, 2023 |  |  | 0 |  |  |  |
Common stock beginning balance (in shares) at Mar. 31, 2023 |  | 190,430,000 |  |  |  |  |
Beginning balance at Mar. 31, 2023 | 88,046 | $ 190 | $ 0 | 1,712,558 | (1,621,654) | (163) | (2,885)
Preferred stock beginning balance (in shares) at Mar. 31, 2023 |  |  | 0 |  |  |  |
Stock-based compensation | 3,815 |  |  | 3,815 |  |  |
Issuance of equity-classified warrants | 307 |  |  | 307 |  |  |
Stock Issued During Period, Shares, New Issues |  | 55,288,000 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 139,034 | $ 55 |  | 138,979 |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) | 75,000 |  |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | $ 0 |  |  |  |  |  |
Net loss | (44,904) |  |  |  | (44,904) |  |
Unrealized gain (loss) on investments | 63 |  |  |  |  | 63 |
Common stock ending balance (in shares) at Jun. 30, 2023 |  | 245,793,000 |  |  |  |  |
Ending balance at Jun. 30, 2023 | 186,361 | $ 245 | $ 0 | 1,855,659 | (1,666,558) | (100) | (2,885)
Preferred stock ending balance (in shares) at Jun. 30, 2023 |  |  | 0 |  |  |  |
Stock-based compensation | 3,898 |  |  | 3,898 |  |  |
Net loss | (50,525) |  |  |  | (50,525) |  |
Unrealized gain (loss) on investments | (13) |  |  |  |  | (13) |
Other | (211) |  |  | (211) |  |  |
Common stock ending balance (in shares) at Sep. 30, 2023 |  | 245,793,000 |  |  |  |  |
Ending balance at Sep. 30, 2023 | $ 139,510 | $ 245 | $ 0 | 1,859,346 | (1,717,083) | (113) | (2,885)
Preferred stock ending balance (in shares) at Sep. 30, 2023 |  |  | 0 |  |  |  |
Common stock beginning balance (in shares) at Dec. 31, 2023 | 245,792,668 | 245,793,000 |  |  |  |  |
Beginning balance at Dec. 31, 2023 | $ 93,110 | $ 245 | $ 0 | 1,862,558 | (1,766,839) | 31 | (2,885)
Preferred stock beginning balance (in shares) at Dec. 31, 2023 | 0 |  | 0 |  |  |  |
Stock-based compensation | $ 4,302 |  |  | 4,302 |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 2,304,000 |  |  |  |
Stock Issued During Period, Value, New Issues | 241,575 |  | $ 23 | 241,552 |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) |  | 1,972,000 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | 88 | $ 3 |  | 85 |  |  |
Repurchase of common stock | (1,730) |  |  |  |  |  | (1,730)
Net loss | (48,397) |  |  |  | (48,397) |  |
Unrealized gain (loss) on investments | (81) |  |  |  |  | (81) |
Common stock ending balance (in shares) at Mar. 31, 2024 |  | 247,765,000 |  |  |  |  |
Ending balance at Mar. 31, 2024 | $ 288,867 | $ 248 | $ 23 | 2,108,497 | (1,815,236) | (50) | (4,615)
Preferred stock ending balance (in shares) at Mar. 31, 2024 |  |  | 2,304,000 |  |  |  |
Common stock beginning balance (in shares) at Dec. 31, 2023 | 245,792,668 | 245,793,000 |  |  |  |  |
Beginning balance at Dec. 31, 2023 | $ 93,110 | $ 245 | $ 0 | 1,862,558 | (1,766,839) | 31 | (2,885)
Preferred stock beginning balance (in shares) at Dec. 31, 2023 | 0 |  | 0 |  |  |  |
Issuance of equity-classified warrants | $ 0 |  |  |  |  |  |
Net loss | (166,637) |  |  |  |  |  |
Unrealized gain (loss) on investments | $ 318 |  |  |  |  |  |
Common stock ending balance (in shares) at Sep. 30, 2024 | 363,020,303 | 363,020,000 |  |  |  |  |
Ending balance at Sep. 30, 2024 | $ 178,512 | $ 363 | $ 0 | 2,115,891 | (1,933,476) | 349 | (4,615)
Preferred stock ending balance (in shares) at Sep. 30, 2024 | 2,304,147 |  | 0 |  |  |  |
Common stock beginning balance (in shares) at Mar. 31, 2024 |  | 247,765,000 |  |  |  |  |
Beginning balance at Mar. 31, 2024 | $ 288,867 | $ 248 | $ 23 | 2,108,497 | (1,815,236) | (50) | (4,615)
Preferred stock beginning balance (in shares) at Mar. 31, 2024 |  |  | 2,304,000 |  |  |  |
Stock-based compensation | 4,859 |  |  | 4,859 |  |  |
Stock Issued During Period, Value, New Issues | (175) |  |  | (175) |  |  |
Issuance of common stock under Equity Incentive Plans (in shares) |  | 48,000 |  |  |  |  |
Issuance of common stock under Equity Incentive Plans | 1 |  |  | 1 |  |  |
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 | (53,429) |  |  |  | (53,429) |  |
Unrealized gain (loss) on investments | (143) |  |  |  |  | (143) |
Common stock ending balance (in shares) at Jun. 30, 2024 |  | 363,020,000 |  |  |  |  |
Ending balance at Jun. 30, 2024 | 239,980 | $ 363 | $ 0 | 2,113,090 | (1,868,665) | (193) | (4,615)
Preferred stock ending balance (in shares) at Jun. 30, 2024 |  |  | 0 |  |  |  |
Stock-based compensation | 2,801 |  |  | 2,801 |  |  |
Net loss | (64,811) |  |  |  | (64,811) |  |
Unrealized gain (loss) on investments | $ 542 |  |  |  |  | 542 |
Common stock ending balance (in shares) at Sep. 30, 2024 | 363,020,303 | 363,020,000 |  |  |  |  |
Ending balance at Sep. 30, 2024 | $ 178,512 | $ 363 | $ 0 | $ 2,115,891 | $ (1,933,476) | $ 349 | $ (4,615)
Preferred stock ending balance (in shares) at Sep. 30, 2024 | 2,304,147 |  | 0 |  |  |  |

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