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Income Per Share - Anti-Dilutive Shares Not Recognized in Diluted Net Income (Loss) per Share Calculation (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares 1,195,305 1,216,456
Restricted share units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares 924,385 7,322,644