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Stockholders' Equity - Stock Option Activity (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Number of Options |  |  |  |
Vested and expected to vest at June 30, 2021 (in shares) | 2,886,407 | 2,886,407 |  |
Weighted Average Exercise Price Per Share |  |  |  |
Vested and expected to vest at June 30, 2021 (in USD per share) | $ 7.72 | $ 7.72 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |
Vested and expected to vest at March 31, 2021, intrinsic value | $ 7,262,361 | $ 7,262,361 |  |
Authorized shares under the plan (in shares) | 3,150,000 | 3,150,000 |  |
Options to purchase Common Stock |  |  |  |
Weighted-average assumptions |  |  |  |
Risk-free interest rate |  | 0.94% | 0.44% |
Dividend yield (as a percent) |  | 0.00% | 0.00% |
Expected volatility (as a percent) |  | 108.00% | 105.00% |
Expected term |  | 6 years | 5 years 10 months 24 days |
Number of Options |  |  |  |
Balance outstanding at the beginning of the period (in shares) |  | 1,860,507 |  |
Granted (in shares) |  | 1,117,106 |  |
Cancelled / Forfeited (in shares) |  | (10,770) |  |
Balance outstanding at the end of the period (in shares) | 2,966,843 | 2,966,843 |  |
Exercisable at the end of the period (in shares) | 1,282,401 | 1,282,401 |  |
Weighted Average Exercise Price Per Share |  |  |  |
Balance outstanding at the beginning of the period (in USD per share) |  | $ 7.43 |  |
Granted (in USD per share) |  | 7.98 |  |
Canceled / Forfeited (in USD per share) |  | 2.55 |  |
Balance outstanding at the end of the period (in USD per share) | $ 7.65 | 7.65 |  |
Exercisable at the end of the period (in USD per share) | $ 9.65 | $ 9.65 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |
Options outstanding, intrinsic value | $ 7,439,918 | $ 7,439,918 |  | $ 27,963,363
Exercisable at the end of the period, intrinsic value | 5,076,084 | $ 5,076,084 |  |
Accelerated compensation expense | $ 600,000 |  |  |
Equity Incentive Plan 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures |  |  |  |
Number of remaining shares available for issuance (in shares) | 2,304,110 | 2,304,110 |  |

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