Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Financial Liabilities Subject to Fair Value Measurements (Detail)

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Stockholders' Equity (Deficit) - Financial Liabilities Subject to Fair Value Measurements (Detail) - Warrants - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 19,295 $ 3,961
Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 19,295 3,961
February 2015 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 12,965  
February 2015 Warrants | Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 12,965  
March 2011 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 6,330 3,961
March 2011 Warrants | Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 6,330 $ 3,961