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Stock-Based Compensation - Restricted stock unit (Details) - Restricted stock units
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of Restricted Stock Units  
Outstanding - December 31, 2020 | shares 0
Granted | shares 372,293
Forfeited | shares (10,502)
Outstanding June 30, 2021 | shares 361,791
Weighted Average Fair Value Per Share  
Outstanding - December 31, 2020 | $ / shares $ 0
Granted | $ / shares 55.18
Forfeited | $ / shares 53.86
Outstanding June 30, 2021 | $ / shares $ 55.22