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Net Income per Share - Additional Information (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Effect of dilutive securities - Convertible Notes (in shares) 28,913,665 29,674,442  
RSU      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Unvested RSUs (in shares) 1,836,210 1,612,676 1,373,457