Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Stockholders' Equity - Financial Liabilities Subject to Fair Value Measurements (Detail) - Warrants - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
2017 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 1,392  
2017 Warrants | Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 1,392  
2014 Warrants    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements   $ 49
2014 Warrants | Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements   $ 49