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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Unit (RSUs)
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of RSUs  
Number of RSUs - Beginning balance | shares 108,551
Number of RSUs, Granted | shares 301,366
Number of RSUs, Vested | shares (7,661)
Number of RSUs, Forfeited | shares (34,710)
Number of RSUs - Ending balance | shares 367,546
Weighted-Average Grant Date Fair Value  
Weighted-Average Grant Date Fair Value - Beginning balance | $ / shares $ 115.54
Weighted-Average Grant Date Fair Value, Granted | $ / shares 120.25
Weighted-Average Grant Date Fair Value, Vested | $ / shares 174.67
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 127.57
Weighted-Average Grant Date Fair Value - Ending balance | $ / shares $ 117.03