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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Net Income Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Antidilutive securities restricted stock units (in shares) 197,900 0 341,443 0