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Stock-Based Compensation - Additional Information (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2021 | Apr. 05, 2021 | Mar. 04, 2021 | Aug. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | May 17, 2021 | Dec. 31, 2020 | Jun. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding options issued |  | 751,371 |  |  | 11,072,894 |  | 11,072,894 |  | 347,267 | 6,840,719 |
Stock options, granted |  |  |  |  | 2,755,000 | 203,178 | 7,150,438 | 1,252,178 |  |  |
Unrecognized compensation costs related to unvested restricted stock outstanding |  |  |  |  | $ 2,400 |  | $ 2,400 |  |  |  |
Expected recognition period |  |  |  |  |  |  | 2 years 2 months 8 days |  |  |  |
Options available for future grant |  |  |  |  | 2,224,159 |  | 2,224,159 |  |  |  |
Exercise price of stock options |  |  |  |  |  |  | $ 2.86 |  |  |  |
Weighted-average grant date fair value |  |  |  |  | $ 1.08 | $ 1.96 | $ 1.91 | $ 2.45 |  |  |
Number of options vested | 10,417 |  | 216,700 |  |  |  |  |  |  |  |
Adiitional stock compensation expenses |  |  |  |  |  |  | $ 2,000.0 |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options, granted |  |  |  | 2,625,000 |  |  |  |  |  |  |
Exercise price of stock options |  |  |  | $ 1.64 |  |  |  |  |  |  |
Unvested Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested restricted stock outstanding |  |  |  |  | $ 8,000,000.0 |  | $ 8,000,000.0 |  |  |  |
Expected recognition period |  |  |  |  |  |  | 2 years 10 days |  |  |  |
Number of Unvested Stock options | 167,023 |  |  |  |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Accelerated Vesting Share | 4,137 | 226,889 |  |  |  |  |  |  |  |  |
Outside 2012 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding options issued |  |  |  |  | 97,500 |  | 97,500 |  |  |  |
2020 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options available for future grant |  |  |  |  | 2,224,159 |  | 2,224,159 |  |  |  |
Shares available for new issue |  |  |  |  |  |  |  |  |  |  | 21,000,000
Number of Unvested Stock options |  |  |  | 0 |  |  |  |  |  |  |
2012 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options, granted |  |  |  | 0 |  |  |  |  |  |  |
2003 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options, granted |  |  |  | 0 |  |  |  |  |  |  |

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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