Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Outstanding Warrants (Parenthetical) (Detail)

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Common Stock - Summary of Outstanding Warrants (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2014
Series A Warrants [Member]
 
Class of Warrant or Right [Line Items]  
Warrants issued date 2014-07
Series B Warrants [Member]
 
Class of Warrant or Right [Line Items]  
Warrants issued date 2014-07
Stock warrants [Member]
 
Class of Warrant or Right [Line Items]  
Warrants issued date 2010-10
Pre-Funded Series B Warrants [Member]
 
Class of Warrant or Right [Line Items]  
Warrants issued date 2014-07