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Stock-Based Compensation - Summary of unvested equity classified incentive units (Details) - Equity Classified Incentive Units
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 37,116,025
Granted (in shares) | shares 1,548,223
Vested (in shares) | shares (7,123,673)
Forfeited (in shares) | shares (82,500)
Cancelled (in shares) | shares (31,458,075)
Ending balance (in shares) | shares 0
Weighted- Average Grant Date Fair Value (per share)  
Beginning balance (in dollars per share) | $ / shares $ 0.74
Granted (in dollars per share) | $ / shares 9.06
Vested (in dollars per share) | $ / shares 0.40
Forfeited (in dollars per share) | $ / shares 0.79
Cancelled (in dollars per share) | $ / shares 1.23
Ending balance (in dollars per share) | $ / shares $ 0