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Stock-Based Compensation Expense and Employee Benefit Plans - Unvested Restricted Stock Unit Activity (Details) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Unvested Restricted Stock Unit Activity    
Unvested balance (in shares) 6,418,788 10,112,266
Granted (in shares) 6,475,536 4,744,467
Vested (in shares) (2,904,996) (7,806,038)
Forfeited (in shares) (1,621,664) (631,907)
Unvested balance (in shares) 8,367,664 6,418,788
Weighted Average Grant Date Fair Value    
Unvested balance (in dollars per share) $ 13.71 $ 17.29
Granted (in dollars per share) 25.82 12.43
Vested (in dollars per share) 17.04 17.48
Forfeited (in dollars per share) 20.97 14.93
Unvested balance (in dollars per share) $ 20.52 $ 13.71