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Net Income Per Share - Summary of Shares Excluded from the Calculation of Diluted Net (Loss) Income Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share (in shares) 4,876,812 60,363 4,735,878 1,641,690
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share (in shares) 392,435 8,166 276,803 467,072
Restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share (in shares) 836,684 52,197 581,439 1,174,618
Convertible senior notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of earnings per share (in shares) 3,647,693 0 3,877,636 0