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Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 12, 2016
May 31, 2016
Sep. 30, 2016
Sep. 30, 2016
Class of Warrant or Right [Line Items]        
Number of shares sold in underwritten public offering   48,543,692    
Fair value of warrants liability   $ 44,700    
Exercise price of warrants   $ 1.50    
Class of warrants exercised       0
Warrant fair value adjustments       $ (7,879)
A Warrants        
Class of Warrant or Right [Line Items]        
Fair value of warrants liability $ 12,800   $ 4,900 $ 4,900
Class of warrants expiration period upon issuance   2 years    
Valuation technique       Monte Carlo valuation pricing model
Warrant liability fair value assumptions, risk-free rate 0.76%     0.66%
Warrant liability fair value assumptions, dividend yield 0.00%     0.00%
Warrant liability fair value assumptions, remaining term 2 years     1 year 7 months 6 days
Warrant liability fair value assumptions, volatility rate 95.00%     90.00%
Warrant fair value adjustments     $ 13,200 $ 7,900
B Warrants        
Class of Warrant or Right [Line Items]        
Fair value of warrants liability $ 5,000      
Class of warrants expiration period upon issuance   30 months    
Warrants exercisable date   2017-05    
Maximum | A Warrants        
Class of Warrant or Right [Line Items]        
Warrants to purchase of common stock   36,407,765    
Maximum | B Warrants        
Class of Warrant or Right [Line Items]        
Warrants to purchase of common stock   12,135,921    
Registered Offering        
Class of Warrant or Right [Line Items]        
Number of shares sold in underwritten public offering   48,543,687