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Equity-based Compensation - Compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 1,147 | $ 1,025 | $ 2,318 | $ 2,212
Total unrecognized compensation cost related to options | 3,957 |  | $ 3,957 |
Weighted average period over which the unrecognized compensation cost is expected to be recognized |  |  | 1 year 10 months 17 days |
Performance-based awards |  |  |  |
Equity-based Compensation |  |  |  |
Total unrecognized compensation cost related to options | 783 |  | $ 783 |
Weighted average period over which the unrecognized compensation cost is expected to be recognized |  |  | 1 year 3 months 14 days |
Research and development |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | 282 | 156 | $ 513 | 313
General and administrative |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 865 | $ 869 | $ 1,805 | $ 1,899

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