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Stock Incentive Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 08, 2021 | May 31, 2021 | May 30, 2021 | Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jan. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 38,965 | $ 11,957 | $ 105,893 | $ 18,620 |
Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 29,113,555 |  |
Granted (in dollars per share) |  |  |  |  |  |  | $ 20.07 |  |
Stock Options | 2011 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Fair market value of one share of common stock threshold |  |  |  |  |  |  | 110.00% |  |
Secondary sales of common stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 0 | 9,050 | $ 11,642 | 10,486 |
CEO Long-Term Performance Award | Chief Executive Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 13,400 |  | $ 24,800 |  |
Compensation costs related to unvested outstanding stock options, period for recognition (in years) |  |  |  |  |  |  | 4 years 3 months 18 days |  |
Granted (in shares) |  |  | 47,267 | 19,740,923 |  |  |  |  |
Granted (in dollars per share) |  | $ 23.40 |  | $ 21.49 |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 10.53 |  |
Expected cost to be recognized over remaining derived service period |  |  |  |  | 183,600 |  | $ 183,600 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ 23,100 |  |  |  | 15,882 | $ 0 | $ 45,948 | $ 0 |
Compensation costs related to unvested outstanding stock options, period for recognition (in years) |  |  |  |  |  |  | 3 years 2 months 12 days |  |
Award vesting period (in years) |  |  |  |  |  |  | 4 years |  |
CEO Long-term performance awards |  |  |  |  | 136,400 |  | $ 136,400 |  |
Employee Stock Option, Excluding CEO Long-term Performance Award |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Compensation costs related to unvested outstanding stock options |  |  |  |  | $ 105,800 |  | $ 105,800 |  |
Compensation costs related to unvested outstanding stock options, period for recognition (in years) |  |  |  |  |  |  | 2 years 8 months 12 days |  |
Class A Common Stock | 2021 Stock Option and Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  |  |  | 60,000,000 |  | 60,000,000 |  |
Class A Common Stock | 2021 Stock Option and Incentive Plan | Forecast |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance, annual increase, percent |  |  |  |  |  |  |  |  | 5.00%
Class A Common Stock | 2021 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  |  |  | 6,000,000 |  | 6,000,000 |  |
Purchase price of common stock, percent |  |  |  |  |  |  | 85.00% |  |
Class A Common Stock | 2021 Employee Stock Purchase Plan | Forecast |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance, annual increase, percent |  |  |  |  |  |  |  |  | 1.00%
Common stock reserved for future issuance, annual share increase (in shares) |  |  |  |  |  |  |  |  | 12,000,000
Class A Common Stock | Stock Options | 2011 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Fair market value of one share of common stock threshold |  |  |  |  |  |  | 110.00% |  |
Combined voting power of stockholder, 10% Stockholder |  |  |  |  |  |  | 10.00% |  |
Expiration period (in years) |  |  |  |  |  |  | 10 years |  |
Class A Common Stock | Stock options, 10% Stockholders | 2011 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Combined voting power of stockholder, 10% Stockholder |  |  |  |  |  |  | 10.00% |  |
Expiration period (in years) |  |  |  |  |  |  | 5 years |  |

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