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Stock-Based Compensation - Summary of liability classified incentive unit equivalents rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-Based Compensation Arrangement By Share-Based Payment Award, Liability Classified Incentive Unit Equivalents, Outstanding [Roll Forward]        
Stock-based compensation during period $ 8,146 $ 2,188 $ 27,941 $ 4,961
Liability Classified Incentive Unit Equivalents | Accrued expenses        
Share-Based Compensation Arrangement By Share-Based Payment Award, Liability Classified Incentive Unit Equivalents, Outstanding [Roll Forward]        
Beginning balance     5,702  
Stock-based compensation during period     6,041  
Settlement or modification of awards     (11,743)  
Ending balance $ 0   $ 0