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Stockholders' Equity - Summary of RSU and RSA Award Activity (Details) - Restricted Stock Units and Restricted Stock Awards
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Weighted-Average Grant Date Fair Value per Restricted Stock  
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Beginning Balance | $ / shares $ 12.39
Weighted-Average Grant Date Fair Value per Restricted Stock, Granted | $ / shares 19.67
Weighted-Average Grant Date Fair Value per Restricted Stock, Vested | $ / shares 13.60
Weighted-Average Grant Date Fair Value per Restricted Stock, Forfeited | $ / shares 13.19
Weighted-Average Grant Date Fair Value per Restricted Stock, Unvested Ending Balance | $ / shares $ 15.10
Class A Common Stock  
Outstanding Restricted Stock  
Outstanding Restricted Stock, Unvested Beginning Balance | shares 148,797
Outstanding Restricted Stock, Granted | shares 61,337
Outstanding Restricted Stock, Vested | shares (71,301)
Outstanding Restricted Stock, Forfeited | shares (7,661)
Outstanding Restricted Stock, Unvested Ending Balance | shares 131,172