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Net Income per Share - Additional Information (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of dilutive securities - Convertible Notes (in shares) 28,533,271   29,300,363  
RSU        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Unvested RSUs (in shares) 1,846,173 1,609,324 1,847,860 1,629,848