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Employee Benefit Plans - Summary of Restricted Stock Units (Details) - Restricted Stock Units - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Number of Shares    
Unvested, Beginning balance 7,000,855  
Granted 3,279,068  
Vested (1,993,215)  
Forfeited/cancelled (981,563)  
Unvested, Ending balance 7,305,145 7,000,855
Weighted Average Grant-Date Fair Value    
Unvested, Beginning balance $ 17.72  
Granted 25.56  
Vested 17.83  
Forfeited/cancelled 19.84  
Unvested, Ending balance $ 20.93 $ 17.72
Weighted Average Remaining Contractual Term (in years)    
Unvested, Weighted Average Remaining Contractual Term 1 year 2 months 12 days 1 year 1 month 6 days