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Stockholders' Equity and Employee Benefit Plans - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Unvested, Beginning balance 6,975,994  
Granted 5,091,244  
Vested (4,115,357)  
Forfeited/cancelled (951,026)  
Unvested, Ending balance 7,000,855 6,975,994
Weighted Average Grant-Date Fair Value    
Unvested, Beginning balance $ 14.72  
Granted 19.43  
Vested 15.07  
Forfeited/cancelled 16.25  
Unvested, Ending balance $ 17.72 $ 14.72
Weighted Average Remaining Contractual Term (in years)    
Unvested, Weighted Average Remaining Contractual Term 1 year 1 month 6 days 2 years 2 months 12 days