Quarterly report pursuant to Section 13 or 15(d)

Net Loss per Share - Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share (Details)

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Net Loss per Share - Schedule of Anti-dilutive Shares Outstanding Excluded in Calculation of Diluted Net Loss per Share (Details) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Total 1,101,259 2,046,811
Options to Purchase Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Total 824,481 1,287,977
Unvested Restricted Stock Units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Total 110,764 44,238
Warrants to Purchase Common Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Total 166,014 714,596