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Warrants (Detail) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 22, 2015
Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Stock Price $ 1.15    
Volatility 90.00% 90.00%  
Risk-free interest rate 1.62% 1.62%  
Expected dividend yield 0.00% 0.00%  
Expected warrant life 4 years 11 months 23 days 5 years  
Warrant [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Stock Price $ 1.15   $ 1.20
Risk-free interest rate 1.63%   1.65%
Expected dividend yield 0.00%   0.00%
Minimum [Member] | Warrant [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Volatility 80.70%   72.90%
Expected warrant life 3 years 7 months 6 days   4 years 1 month 6 days
Maximum [Member] | Warrant [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Volatility 90.00%   88.10%
Expected warrant life 4 years 11 months 23 days   4 years 3 months 29 days