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Net Loss Per Share - Summary of Potentially Dilutive Shares of Common Stock (Details) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,274,353 4,492,966
Outstanding stock options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 604,265 820,587
Unvested restricted stock units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 233 15,401
Warrants to purchase common stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,669,855 3,656,978