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Convertible Preferred Stock and Stockholders' Equity - Stock based compensation for all stock awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Convertible preferred stock |  |  |  |
Total stock-based compensation expense | $ 4,861 | $ 11,765 | $ 19,396 | $ 32,376
Research and Development |  |  |  |
Convertible preferred stock |  |  |  |
Total stock-based compensation expense | 2,448 | 5,295 | 10,146 | 16,248
General and Administrative |  |  |  |
Convertible preferred stock |  |  |  |
Total stock-based compensation expense | $ 2,413 | $ 6,470 | $ 9,250 | $ 16,128

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