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Stock-based compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Share-based compensation |  |  |
Proceeds from issuance of restricted stock award |  | $ 523 |
Restricted Stock |  |  |
Share-based compensation |  |  |
Vesting Period | 4 years |  |
Proceeds from issuance of restricted stock award | $ 500 |  |
Number of shares |  |  |
Granted (in shares) | 248,903 | 248,903 |
Unvested as of September 30, 2021 (in shares) |  | 248,903 |
Weighted average fair value |  |  |
Granted (in dollars per share) | $ 2.10 | $ 2.10 |
Unvested as of September 30, 2021 (in dollars per share) |  | $ 2.10 |
Restricted Stock | Other long-term liabilities |  |  |
Share-based compensation |  |  |
Amount of restricted common stock liability |  | $ 700 | $ 0

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