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Net Loss Per Share - Schedule of Computation of Diluted Weighted-Average Shares Outstanding Anti-Dilutive (Detail) - shares
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Term Loan [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 85,251 85,251
Warrants To Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 3,284,440 3,284,440
Options to Purchase Common Stock [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Potential dilutive securities excluded from computation of diluted net loss per common share 3,003,785 3,061,119