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Equity-based Compensation - Compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 522 | $ 896 | $ 1,729 | $ 3,214
Total unrecognized compensation cost related to options | 2,035 |  | $ 2,035 |
Weighted average period over which the unrecognized compensation cost is expected to be recognized |  |  | 2 years 6 months 25 days |
Performance-based awards |  |  |  |
Equity-based Compensation |  |  |  |
Total unrecognized compensation cost related to options | 51 |  | $ 51 |
Weighted average period over which the unrecognized compensation cost is expected to be recognized |  |  | 2 months 19 days |
Research and development |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | 307 | 291 | $ 948 | 804
General and administrative |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 215 | $ 605 | $ 781 | $ 2,410

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