Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity - Financial Liabilities Subject to Fair Value Measurements (Detail) - Warrants - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
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
February 2015 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 2,490 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 $ 2,490 1,826
March 2011 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements   38
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