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Stock-Based Compensation - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 20 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation during period | $ 8,146,000 | $ 2,188,000 | $ 27,941,000 | $ 4,961,000 |  |
Common Class B |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 12,755,906 |  | 12,755,906 |  | 12,755,906 | 0
Weighted-average grant date fair value of options granted (in dollars per share) |  |  | $ 13.42 |  |  |
2021 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized stock-based compensation cost | $ 14,500,000 |  | $ 14,500,000 |  | $ 14,500,000 |
Stock-based compensation during period | $ 800,000 |  | $ 5,100,000 |  |  |
Expiration period |  |  | 10 years |  |  |
Weighted-average grant date fair value of options granted (in dollars per share) |  |  | $ 8.79 |  |  |
2021 Equity Incentive Plan | Common Class A |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for future issuance (in shares) | 20,800,000 |  | 20,800,000 |  | 20,800,000 |
Incentive Unit Plan | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 3,000,000 |  | 3,000,000 |  | 3,000,000 |
Participation threshold before modification |  |  | $ 2.00 |  |  |
Participation threshold after modification |  |  | $ 3.00 |  |  |
Incentive Unit Plan | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 3,000,000 |  | 3,000,000 |  | 3,000,000 |
Participation threshold before modification |  |  | $ 2.00 |  |  |
Participation threshold after modification |  |  | $ 4.00 |  |  |
Incentive Unit Plan | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 1,000,000 |  | 1,000,000 |  | 1,000,000 |
Participation threshold before modification |  |  | $ 5.00 |  |  |
Participation threshold after modification |  |  | $ 6.00 |  |  |
Incentive Unit Plan | Tranche Four |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 1,000,000 |  | 1,000,000 |  | 1,000,000 |
Participation threshold before modification |  |  | $ 5.00 |  |  |
Participation threshold after modification |  |  | 7.00 |  |  |
Equity classified awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized stock-based compensation cost | $ 129,500,000 |  | $ 129,500,000 |  | $ 129,500,000 |
Unrecognized stock-based compensation cost, period for recognition |  |  | 3 years 4 months 24 days |  |  |
Liability classified awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized stock-based compensation cost | $ 1,000,000 |  | $ 1,000,000 |  | $ 1,000,000 |
Unrecognized stock-based compensation cost, period for recognition |  |  | 1 year 7 months 6 days |  |  |
Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 82,999 |  | 82,999 |  | 82,999 | 0
Amount of recognized liability | $ 800,000 |  | $ 800,000 |  | $ 800,000 |
Restricted stock units | 2021 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 4,543,432 |  | 4,543,432 |  | 4,543,432 | 0
Employee stock | 2021 Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum eligible employee compensation |  |  | 15.00% |  |  |
Offering period |  |  | 27 months |  |  |
Employee stock | 2021 Employee Stock Purchase Plan | Common Class A |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock available for sale (in shares) | 4,000,000 |  | 4,000,000 |  | 4,000,000 |
Equity Classified Incentive Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 0 |  | 0 |  | 0 | 37,116,025
Percentage of awards vesting |  |  | 25.00% |  |  |
Award vesting period |  |  | 4 years |  |  |
Fair value of awards vested |  |  | $ 3,100,000 |  |  |
Liability Classified Incentive Unit Equivalents |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of awards issued | 0 |  | 0 |  | 0 | 2,851,516
Award vesting period |  |  |  | 5 years | 4 years |
Liability Classified Incentive Unit Equivalents | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards vesting |  |  |  | 12.50% | 25.00% |
Liability Classified Incentive Unit Equivalents | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards vesting |  |  |  | 12.50% | 25.00% |
Liability Classified Incentive Unit Equivalents | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards vesting |  |  |  | 12.50% | 25.00% |
Liability Classified Incentive Unit Equivalents | Tranche Four |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards vesting |  |  |  | 12.50% | 25.00% |
Liability Classified Incentive Unit Equivalents | Tranche Five |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of awards vesting |  |  |  | 50.00% |  |

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