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Stock-Based Compensation - Schedule of Restricted Stock Units Activity (Details)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of Shares  
Outstanding and Unvested at January 1, 2020 (in shares) | shares 1,102,311
Restricted stock units granted (in shares) | shares 837,896
Restricted stock units vested (in shares) | shares (840,812)
Restricted stock cancelled (in shares) | shares (54,415)
Outstanding and Unvested at December 31, 2020 (in shares) | shares 1,044,980
Per Share Weighted-Average Grant-Date Fair Value (in usd per share)  
Outstanding and Unvested at January 1, 2020 (in shares) | $ / shares $ 5.95
Restricted stock units granted (in usd per share) | $ / shares 94.74
Restricted stock units vested (in usd per share) | $ / shares 9.37
Restricted stock units forfeited (in usd per share) | $ / shares 40.37
Outstanding and Unvested at December 31, 2020 (in shares) | $ / shares $ 72.59