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Stock-based Compensation - Non-vested Restricted Stock (Details) - Restricted stock
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding , Beginning Balance (in shares) | shares 7,094,785,000
Granted (in shares) | shares 0
Exercised (in shares) | shares (165,870,000)
Canceled or forfeited (in shares) | shares (174,268,000)
Vested (in shares) | shares (364,000)
Nonvested, Ending Balance (in shares) | shares 6,754,283,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Outstanding , Beginning Balance (in dollars per share) | $ / shares $ 3.93
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 1.09
Canceled or forfeited (in dollars per share) | $ / shares 4.53
Vested (in dollars per share) | $ / shares 2.30
Nonvested, Ending Balance (in dollars per share) | $ / shares $ 4.01