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Fair Value Measurements (Details 2)
9 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Valuation technique for assets measured and recorded at fair value    
Expected dividend yield (as a percent)   0.00%
Minimum    
Valuation technique for assets measured and recorded at fair value    
Risk-free interest rate (as a percent) 0.21% 0.37%
Volatility (as a percent) 119.16% 55.93%
Expected average term 1 year 5 months 1 day 8 months 1 day
Maximum    
Valuation technique for assets measured and recorded at fair value    
Risk-free interest rate (as a percent) 1.35% 1.01%
Volatility (as a percent) 136.62% 123.53%
Expected average term 4 years 15 days 3 years 3 months 18 days