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Stock Warrants (Additional Information) (Detail) - $ / shares
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]    
Weighted average term of warrants 2 years 6 months  
Weighted average exercise price of warrants per share $ 2.39  
Class Of Warrant Or Right Outstanding 560,329 5,236,660
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 4,168,267  
Warrants 1    
Class of Warrant or Right [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 3,554,004  
Warrant [Member]    
Class of Warrant or Right [Line Items]    
Stock Issued During Period, Shares, Conversion of Convertible Securities 1,262,626