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Shared-Based Compensation (Ristricted Stock Unit Activity and Position) (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Shared-based Compensation Ristricted Stock Unit Activity And Position  
Unvested, number of shares (in shares) | shares 1,983,000
Unvested, weighted average award price (in dollars per share) | $ / shares $ 0.76
Granted, number of shares (in shares) | shares 899,000
Granted, weighted average award price (in dollars per share) | $ / shares $ 7.10
Vested, number of shares (in shares) | shares (368,000)
Vested, weighted average award price (in dollars per share) | $ / shares $ 0.10
Forfeited, number of shares (in shares) | shares (69,000)
Forfeited, weighted average award price (in dollars per share) | $ / shares $ 0.98
Unvested, number of shares (in shares) | shares 2,445,000
Unvested, weighted average award price (in dollars per share) | $ / shares $ 3.18