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Warrant Liability (Details) - 6 months ended Jun. 30, 2015 - $ / shares
Total
Series A Warrants [Member]  
Assumption  
Expected price volatility 90.00%
Expected term (in years) 2 years 9 months 18 days
Risk-free interest rate 0.93%
Dividend yield 0.00%
Weighted-average fair value of warrants (in dollars per share) $ 0.31
Class A Warrants [Member]  
Assumption  
Expected price volatility 90.00%
Expected term (in years) 5 years 3 months 18 days
Risk-free interest rate 1.67%
Dividend yield 0.00%
Weighted-average fair value of warrants (in dollars per share) $ 0.51
Underwriter Warrants [Member]  
Assumption  
Expected price volatility 90.00%
Expected term (in years) 4 years 3 months 18 days
Risk-free interest rate 1.40%
Dividend yield 0.00%
Weighted-average fair value of warrants (in dollars per share) $ 0.45