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Net Loss Per Share - Potential Dilutive Outstanding Securities Excluded From Diluted Net Loss Per Common Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted weighted-average shares outstanding 5,356,623 576,142 5,356,623 576,142
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted weighted-average shares outstanding 1,605,790 545,640 1,605,790 545,640
Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted weighted-average shares outstanding 3,750,833 30,502 3,750,833 30,502