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Equity-based Compensation - Summary of RSU Award Activity (Details) - Restricted Stock Units (RSUs) - Common Class A - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Class A Common Stock, Granted 0 28,224  
Weighted Average Grant Date Fair Value, Beginning balance   $ 15.89  
Weighted Average Grant Date Fair Value,Granted [1]   48.16  
Weighted Average Grant Date Fair Value,Released   15.70  
Weighted Average Grant Date Fair Value,Ending Balance $ 41.53 $ 41.53 $ 15.89
Weighted Average Remaining Contractual Term     1 year 2 months 12 days
Weighted Average Remaining Contractual Term, Granted [1]   6 months  
Weighted Average Remaining Contractual Term   8 months 12 days  
Aggregate Intrinsic Value, Balance $ 2,200 $ 2,200 $ 628
2019 Equity Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Class A Common Stock, Beginning balance   20,140  
Class A Common Stock, Granted [1]   28,224  
Class A Common Stock, Released   (12,742)  
Class A Common Stock, Ending balance 35,622 35,622 20,140
[1] Includes an adjustment of 11,763 shares underlying performance-based RSU awards made during the nine months ended September 30, 2021. The vesting of such RSUs is based upon the Company’s current performance against predefined financial targets.