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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock awards
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Awards  
Unvested balance, beginning of period (in shares) | shares 12,093,723
Granted (in shares) | shares 0
Vested (in shares) | shares (504,052)
Forfeited (in shares) | shares (8,228)
Unvested balance, end of period (in shares) | shares 11,581,443
Weighted Average Grant-Date Fair Value  
Beginning of period (in dollars per share) | $ / shares $ 2.33
Granted (in dollars per share) | $ / shares 0
Vested (in dollars per share) | $ / shares 5.39
Forfeited (in dollar per share) | $ / shares 8.57
End of period (in dollars per share) | $ / shares $ 2.19
Officer and employees  
Weighted Average Grant-Date Fair Value  
Vesting period 3 years
Director  
Weighted Average Grant-Date Fair Value  
Vesting period 1 year