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Derivative Liability and Fair Value Measurements (Estimate the fair value of warrants outstanding) (Detail) - Monte Carlo Options Lattice Pricing Model Warrants Outstanding [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assumptions for Pricing Model:    
Expected term in years 2 years 10 months 6 days  
Volatility range for years 104.00%  
Risk-free interest rate 0.64%  
Minimum [Member]    
Assumptions for Pricing Model:    
Expected term in years   3 years 7 months 2 days
Volatility range for years   81.00%
Risk-free interest rate   0.83%
Maximum [Member]    
Assumptions for Pricing Model:    
Expected term in years   3 years 9 months 11 days
Volatility range for years   89.00%
Risk-free interest rate   1.11%