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Stock Incentive Plans - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 08, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 38,965 | $ 11,957 | $ 105,893 | $ 18,620
Stock options |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based compensation expense |  | 22,180 | 2,907 | 47,322 | 8,134
Secondary sales of common stock |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based compensation expense |  | 0 | 9,050 | 11,642 | 10,486
Unvested RSUs outstanding |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based compensation expense | $ 23,100 | 15,882 | 0 | 45,948 | 0
Employee Stock Purchase Plan |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 903 | $ 0 | $ 981 | $ 0

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