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Stock option plan - Summary (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 31, 2016
Stock option plan |  |  |  |  |
Stock based compensation expense | $ 4,983,023 | $ 1,345,722 | $ 329,814 |  |
Options to purchase common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Expiration period after termination of employment | 6 months |  |  |  |
Vesting period | 4 years |  |  |  |
2016 Amended and Restated Stock Option Program |  |  |  |  |
Stock option plan |  |  |  |  |
Options outstanding |  | 0 |  |  |
2016 Amended and Restated Stock Option Program | Options to purchase common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares authorized |  |  |  |  | 1,224,824
2017 Amended and Restated Stock Option Program | Options to purchase common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares authorized |  |  |  | 1,946,849 |
2018 Amended and Restated Stock Option Program | Options to purchase common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares authorized |  |  | 3,069,999 |  |
2019 Equity Incentive Plan |  |  |  |  |
Stock option plan |  |  |  |  |
Options outstanding | 3,771,459 | 3,499,934 | 1,844,188 | 1,897,206 |
Shares available for grant | 1,580,804 |  |  |  |
Unrecognized compensation cost | $ 16,359,450 |  |  |  |
2019 Equity Incentive Plan | Weighted average |  |  |  |  |
Stock option plan |  |  |  |  |
Recognition period for unrecognized compensation cost | 2 years 10 months 24 days |  |  |  |

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