Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Deficit) - Outstanding Warrants Valuation Assumption (Detail)

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Stockholders' Equity (Deficit) - Outstanding Warrants Valuation Assumption (Detail) - $ / shares
12 Months Ended
Feb. 18, 2015
Dec. 31, 2015
Dec. 31, 2014
Feb. 28, 2015
March 2011 Warrants        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Risk-free interest rate   0.16% 0.67%  
Expected life (in years)   2 months 16 days 1 year 2 months 16 days  
Dividend yield   0.00% 0.00%  
Volatility   179.00% 49.00%  
Stock price   $ 0.48 $ 3.18  
February 2015 Warrants        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]        
Risk-free interest rate 1.52% 1.76%    
Expected life (in years) 5 years 4 years 1 month 21 days    
Dividend yield 0.00% 0.00%    
Volatility 50.00% 112.00%    
Stock price   $ 0.48   $ 4.26