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Stock-Based Compensation - Summary of Activity for Restricted Stock Awards (Details) - $ / shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Number of Shares    
Granted 2,390,345  
Weighted Average Grant Date Fair Value    
Granted $ 11.64  
Restricted Stock    
Number of Shares    
Unvested at beginning of year 6,516,101  
Granted 2,390,345 1,940,798
Vested (2,097,411)  
Canceled (110,000)  
Unvested at end of year 6,699,035  
Weighted Average Grant Date Fair Value    
Unvested at beginning of year $ 13.31  
Granted 11.64 $ 10.42
Vested 14.09  
Canceled 12.62  
Unvested at end of year $ 12.49