Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)

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Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Risk-free interest rate   1.62%    
Expected volatility   88.00%    
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Minimum [Member]        
Risk-free interest rate 0.22%   0.02% 0.90%
Expected term (years) 1 year 4 years 10 months 2 days 1 year 4 years 6 months 11 days
Expected volatility 89.00%   84.00% 88.00%
Maximum [Member]        
Risk-free interest rate 1.01%   1.30% 1.62%
Expected term (years) 4 years 7 months 28 days 5 years 5 years 18 days 5 years
Expected volatility 95.00%   95.00% 89.00%