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Fair Value Measurements - Schedule of Fair Value Changes by Income Statement Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total change in fair value of Class B Units |  |  | $ (728,079) | $ (113,866)
Common Stock - Class B |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total change in fair value of Class B Units | $ 129,546 | $ 64,070 | 728,079 | 113,866
Cost of revenue | Common Stock - Class B |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total change in fair value of Class B Units | 24,028 | 12,167 | 136,417 | 22,052
Sales and marketing | Common Stock - Class B |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total change in fair value of Class B Units | 2,607 | 943 | 10,870 | 1,965
General and administrative | Common Stock - Class B |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total change in fair value of Class B Units | $ 102,911 | $ 50,960 | $ 580,792 | $ 89,849

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