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Stock Options and Warrants - Warrants Issued in Connection with October 2014 Financing - Additional Information (Detail)
9 Months Ended
Sep. 30, 2015
$ / shares
Series C warrants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Closing price of common stock $ 3.95
Warrant exercise price $ 1.79
Stock price volatility 77.60%
Options and warrant expected term 15 days
Dividend rate 0.00%
Series C warrants [Member] | Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Closing price of common stock $ 1.79
Series C warrants [Member] | U.S. Treasury Notes [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk free interest rate 0.00%
Series-A and Placement Agent Warrants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Closing price of common stock $ 3.95
Warrant exercise price $ 1.79
Stock price volatility 77.60%
Options and warrant expected term 4 years 6 months 15 days
Dividend rate 0.00%
Series-A and Placement Agent Warrants [Member] | U.S. Treasury Notes [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk free interest rate 1.26%