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Stock Based Compensation - Compensation costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Compensation costs |  |  |  |
Equity-based compensation cost | $ 3,051 | $ 2,923 | $ 5,914 | $ 5,145
Unrecognized compensation costs related to restricted stock units | 25,868 | 34,327 | 25,868 | 34,327
Restricted stock units (RSUs) |  |  |  |
Compensation costs |  |  |  |
Equity-based compensation cost | 1,397 | 954 | 2,609 | 1,589
Employee stock option |  |  |  |
Compensation costs |  |  |  |
Equity-based compensation cost | 1,612 | 1,889 | 3,226 | 3,476
ESPP |  |  |  |
Compensation costs |  |  |  |
Equity-based compensation cost | $ 42 | $ 80 | $ 79 | $ 80

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