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Stock Based Awards - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share-based compensation awards granted |  |  | 1,559,000 |
Stock based compensation expense | $ 1.0 | $ 0.4 | $ 2.3 | $ 0.9
Unrecognized stock based compensation expense | $ 4.3 |  | $ 4.3 |
2021 Equity Incentive plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Diluted shares conversion percentage |  |  | 5.00% |
Share-based compensation awards granted |  |  | 0 |
2021 Equity Incentive plan | Class A Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance | 26,333,222 |  | 26,333,222 |
Employee Stock Purchase Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Diluted shares conversion percentage |  |  | 1.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued |  |  | 0 |
Number of Shares Available for Grant | 50,000,000 |  | 50,000,000 |
Employee Stock Purchase Plan | Class A Common Stock |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of Shares Available for Grant | 2,633,322 |  | 2,633,322 |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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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