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Net Loss Per Share - Schedule of Anti-Dilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 11,015,147 9,517,054 11,015,147 9,517,054
Options to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 9,245,981 7,888,763 9,245,981 7,888,763
Warrants to purchase common stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 0 284,091 0 284,091
Restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded (shares) 1,760,710 1,335,744 1,760,710 1,335,744
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