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Stock-Based Compensation - Summary of Service-Based Restricted Stock Units (Details) - Service-Based RSUs
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Units  
Outstanding at beginning of year - Units | shares 367,428
Granted - Units | shares 68,065
Vested and released - Units | shares (151,946)
Forfeited - Units | shares (15,506)
Outstanding at end of year - Units | shares 268,041
Releasable - Units | shares 116,933
Weighted Average Grant Date Fair Value  
Beginning of year - Weighted Average Grant Date Fair Value | $ / shares $ 21.28
Granted - Weighted Average Grant Date Fair Value | $ / shares 32.93
Vested and released - Weighted Average Grant Date Fair Value | $ / shares 20.91
Forfeited - Weighted Average Grant Date Fair Value | $ / shares 29.17
End of year - Weighted Average Grant Date Fair Value | $ / shares 24.00
Releasable - Weighted Average Grant Date Fair Value | $ / shares $ 15.86