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Stockholders' Equity - Summary of RSU and RSA Activity (Details) - Restricted Stock Units and Restricted Stock Awards
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Weighted-Average Grant Date Fair Value per Restricted Stock  
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance | $ / shares $ 15.10
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted | $ / shares 59.13
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested | $ / shares 15.64
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited | $ / shares 15.04
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance | $ / shares $ 23.19
Class A Common Stock  
Outstanding Restricted Stock  
Outstanding Restricted Stock, Unvested Beginning Balance | shares 131,172
Outstanding Restricted Stock, Granted | shares 18,168
Outstanding Restricted Stock, Vested | shares (45,486)
Outstanding Restricted Stock, Forfeited | shares (7,980)
Outstanding Restricted Stock, Unvested Ending Balance | shares 95,874