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Share-based compensation (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 11, 2020 | Jun. 07, 2018 | Sep. 17, 2014
Share-based compensation |  |  |  |  |  |  |
Share based compensation expense |  | $ 2,300,000 | $ 900,000 | $ 500,000 |  |  |
Common stock reserved for issuance |  | 4,341,463 |  |  |  |  |
Stock option vesting period |  | 1 year | 1 year | 6 months |  |  |
Unrecognized share based compensation expense related to non-vested options |  | $ 900,000 |  |  |  |  |
Option to purchase granted |  |  | 381,181 |  |  |  |
Intrinsic value of options outstanding |  | 26,900,000 | $ 20,600,000 |  |  |  |
Intrinsic value of options unvested |  | 800,000 | 1,100,000 |  |  |  |
Intrinsic value of options exercised |  | $ 2,565,056 | $ 4,051,422 | $ 7,088,578 |  |  |
Share-based compensation arrangement by share based payment award percentage of fair market Person holding more then 10% voting stock |  | 110.00% |  |  |  |  |
Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Stock option vesting period |  | 2 years |  |  |  |  |
Stock option vesting, percentage |  | 50.00% | 50.00% |  |  |  |
Option to purchase granted |  | 584,826 |  | 463,754 |  |  |
Options vested |  | 337,727 | 40,588 | 20,500 |  |  |
Minimum |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Expected lives |  | 1 year 6 months | 1 year 6 months | 2 years 6 months |  |  |
Minimum | Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Expected lives |  | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Expected lives |  | 2 years 9 months | 5 years | 5 years |  |  |
Maximum | Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Expected lives |  | 10 years |  |  |  |  |
2014 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  |  | 3,000,000
2018 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  |  | 4,000,000 |
2020 Stock Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Common stock reserved for issuance |  |  |  |  | 3,000,000 |  |
Stock Option Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Options granted |  | 602,526 | 381,181 | 484,254 |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Stock option vesting period | 6 months |  |  |  |  |  |
Option to purchase granted | 17,700 |  |  |  |  |  |

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