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Derivative Liability - Warrants and Derivative Liability - Conversion Option - Valuation Methodology (Detail) - Stock Purchase Warrants [Member] - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Exercise price $ 0.70 $ 0.98
Contractual term (years) 4 years 4 years
Volatility (annual) 150.00% 158.00%
Risk-free rate 1.05% 1.00%
Dividend yield (per share) 0.00% 0.00%