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Share-Based Compensation - Restricted Stock Units (Details) - RSUs
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Restricted Stock Units  
Unvested and outstanding beginning balance (in shares) | shares 415,000
Granted (in shares) | shares 1,215,650
Vested (in shares) | shares (204,500)
Canceled of forfeited (in shares) | shares (320,850)
Unvested and outstanding ending balance (in shares) | shares 1,105,300
Weighted average grant date fair value  
Unvested and outstanding beginning balance weighted average grant date fair value (usd per share) | $ / shares $ 12.09
Granted weighted average grant date fair value (usd per share) | $ / shares 8.27
Vested weighted average grant date fair value (usd per share) | $ / shares 11.49
Canceled or forfeited weighted average grant date fair value (usd per share) | $ / shares 10.33
Unvested and outstanding ending balance weighted average grant date fair value (usd per share) | $ / shares $ 8.62