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Net Income (Loss) Per Share - Additional Information (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Effect of dilutive securities - Convertible Notes (in shares) 24,730,092   29,548,649  
RSU [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Unvested RSUs (in shares) 1,593,070 1,366,017 1,617,398 1,373,252