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Stock-Based Compensation - Summary of outstanding equity classified incentive units (Details) - Equity Classified Incentive Units
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Shares  
Beginning balance (in shares) | shares 93,371,324
Granted (in shares) | shares 1,548,223
Exercised (in shares) | shares 0
Forfeited (in shares) | shares (82,500)
Cancelled (in shares) | shares (94,837,047)
Ending balance (in shares) | shares 0
Vested (in shares) | shares 0
Weighted- Average Participation Threshold  
Beginning weighted average participation threshold (in dollars per share) | $ / shares $ 0.97
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 1.29
Cancelled (in dollars per share) | $ / shares 0.95
Ending weighted average participation threshold (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares $ 0
Aggregate Intrinsic Value  
Beginning aggregate intrinsic value | $ $ 600,316
Ending aggregate intrinsic value | $ 0
Vested aggregate intrinsic value | $ $ 0