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Stock-Based Compensation - Summary of Activity for Restricted Stock Awards (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Number of Shares    
Granted 3,029,949  
Weighted Average Grant Date Fair Value    
Granted $ 11.15  
Restricted Stock    
Number of Shares    
Unvested at beginning of year 6,228,048  
Granted 3,029,949 2,387,645
Vested (1,918,654)  
Canceled (59,260)  
Unvested at end of year 7,280,083  
Weighted Average Grant Date Fair Value    
Unvested at beginning of year $ 12.43  
Granted 11.15 $ 11.64
Vested 13.21  
Canceled 11.65  
Unvested at end of year $ 11.70