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Equity-based Compensation - Compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 72 | $ 129 | $ 264 | $ 342
Total unrecognized compensation cost related to options | 887 |  | $ 887 |
Weighted average period over which the unrecognized compensation cost is expected to be recognized |  |  | 2 years 7 months 6 days |
Research and development |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | (4) | 56 | $ 30 | 161
General and administrative |  |  |  |
Equity-based Compensation |  |  |  |
Total equity-based compensation | $ 76 | $ 73 | $ 234 | $ 181

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