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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 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 from computation of diluted weighted-average shares outstanding (in shares) 5,941,193 4,298,573 5,941,193 4,298,573
Employee Stock Option        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted weighted-average shares outstanding (in shares) 2,190,360 547,571 2,190,360 547,571
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of diluted weighted-average shares outstanding (in shares) 3,750,833 3,751,002 3,750,833 3,751,002