Annual report pursuant to Section 13 and 15(d)

Fair Value of Warrants - Additional Information (Detail)

v3.6.0.2
Fair Value of Warrants - Additional Information (Detail) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]    
Fair value of warrants issue price (USD per share) $ 1.35 $ 3.30
Minimum    
Class of Warrant or Right [Line Items]    
Fair value of stock prices in computing fair value for warrants issued (USD per share) 1.35 3.30
Maximum    
Class of Warrant or Right [Line Items]    
Fair value of stock prices in computing fair value for warrants issued (USD per share) $ 2.14 $ 11.76