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Net Loss Per Share - Schedule of Anti-Dilutive Securities (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]        
Antidilutive securities excluded (shares) 26,944,620 11,015,147 26,944,620 11,015,147
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 10,770,319 9,245,981 10,770,319 9,245,981
Restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 1,580,192 1,760,710 1,580,192 1,760,710
Convertible preferred stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 8,456 8,456 8,456 8,456
Convertible notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 14,585,653 0