Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Stockholders' Equity (Deficit) - Financial Liabilities Subject to Fair Value Measurements (Detail) - Warrants - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 1,864  
Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 1,864  
March 2011 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 38 $ 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 38 $ 3,961
February 2015 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements 1,826  
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 $ 1,826