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Net Loss Per Share - Schedule of Computation of Diluted Weighted-Average Shares Outstanding Anti-Dilutive (Detail) - shares
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
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  
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 4,473,440  
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 1,983,470 832,184
Convertible Notes and Accrued Interest [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   327,505
Convertible Preferred 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   5,269,907