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Stock-Based Compensation - Restricted stock unit (Details) - Restricted stock units
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Number of Restricted Stock Units  
Outstanding - December 31, 2020 | shares 0
Granted | shares 345,571
Forfeited | shares (6,359)
Outstanding June 30, 2021 | shares 339,212
Weighted Average Fair Value Per Share  
Outstanding - December 31, 2020 | $ / shares $ 0
Granted | $ / shares 54.61
Forfeited | $ / shares 53.58
Outstanding June 30, 2021 | $ / shares $ 54.63