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v3.21.1

Equity - Equity Incentive Plan (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 08, 2019 shares | Dec. 31, 2019 shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 shares
Share-based compensation |  |  |  |  |
Grants of stock options |  |  | 743,161 | 1,328,718 |
Stock option forfeitures (in shares) |  |  | 60,100 | 77,937 |
Exercise of stock options (in shares) |  |  | 117,000 |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  | 2,131,058 | 2,697,119 | 2,131,058 | 880,277
Exercise price (in dollars per share) | $ / shares |  |  | $ 1.07 | $ 1.32 |
Noncontrolling interest granted as compensation | $ |  |  |  | $ 6,000 |
Ownership Percentage Of Noncontrolling Interest Increase From Amount Granted As Compensation |  | 1 |  |  |
Equity Incentive Plan [Member] |  |  |  |  |
Share-based compensation |  |  |  |  |
Number of common stock reserved for issuance |  |  | 4,505,728 |  |
Reserved but unissued shares under the Consultant Plan at January 1 |  |  | 1,282,027 | 1,296,462 |
Increases in the number of authorized shares under the Consultant Plan | 1,231,593 |  | 500,764 | 1,236,346 |
Grants of stock options |  |  | 743,161 | 1,328,718 |
Stock option forfeitures (in shares) |  |  | 60,100 | 77,937 |
Exercise of stock options (in shares) |  |  | 117,000 |  |
Reserved but unissued shares under the Consultant Plan at Period End |  | 1,282,027 | 1,216,730 | 1,282,027 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 1,231,593 |  | 500,764 | 1,236,346 |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 15.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 4,004,214 |  |  |  |
Maximum increase in available number of authorized shares as a percentage of new shares issued |  |  | 15.00% |  |
Equity Incentive Plan [Member] | Minimum [Member] |  |  |  |  |
Share-based compensation |  |  |  |  |
Purchase price (as a percent) |  |  | 85.00% |  |

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