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) - February 2015 Warrants - Warrants - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 1,494 $ 1,743
Basis of Fair Value Measurements, Level 3    
Fair Value Inputs Liabilities Quantitative Information [Line Items]    
Financial liabilities subject to fair value measurements $ 1,494 $ 1,743