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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Weighted-Average Exercise Price    
Weighted-Average Exercise Price, Beginning balance | $ / shares $ 10.37  
Weighted-Average Exercise Price, Granted | $ / shares 49.63  
Weighted-Average Exercise Price, Exercised | $ / shares 12.30  
Weighted-Average Exercise Price, Forfeited | $ / shares 13.53  
Weighted-Average Exercise Price, Ending balance | $ / shares $ 10.38 $ 10.37
Weighted-Average Remaining Contractual Term    
Weighted-Average Remaining Contractual Term (in years) 4 years 4 months 28 days 5 years 2 months 12 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Outstanding | $ $ 298,934 $ 223,230
Class A Common Stock    
Number of Shares    
Number of Shares, Beginning balance 4,828  
Number of Shares, Granted 48  
Number of Shares, Exercised (891)  
Number of Shares, Forfeited (7)  
Number of Shares, Ending balance 3,978 4,828
Class B Common Stock    
Number of Shares    
Number of Shares, Beginning balance 796  
Number of Shares, Exercised (66)  
Number of Shares, Ending balance 730 796