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Stock-Based Compensation - Restricted stock unit (Details) - Restricted stock units
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Number of Restricted Stock Units  
Outstanding - December 31, 2020 | shares 373,849
Granted | shares 391,327
Forfeited | shares (12,894)
Share issuance | shares (58,395)
Outstanding December 31, 2021 | shares 693,887
Weighted Average Fair Value Per Share  
Outstanding - December 31, 2020 | $ / shares $ 55.53
Granted | $ / shares 32.15
Forfeited | $ / shares 57.03
Share issuance | $ / shares 53.98
Outstanding December 31, 2021 | $ / shares $ 42.45