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Derivative Liability - Valuation Methodology (Detail) - Stock Purchase Warrants [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Strike price $ 0.74 $ 10.70
Volatility (annual) 155.00% 166.00%
Risk-free rate 1.80% 1.00%
Contractual term (years) 4 years 2 months 12 days 2 years 3 months
Dividend yield (per share) 0.00% 0.00%