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Warrant Liability (Details) - $ / shares
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 19, 2014
Jan. 22, 2014
Jun. 25, 2013
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Summary of assumptions used in connection with the valuation of warrants issued            
Number of shares underlying the warrants     5,416,851 3,044,071 4,723,357 5,309,438
Exercise price     $ 1.65 $ 0.61 $ 0.61 $ 1.65
Volatility     140.00% 117.00% 128.00% 135.00%
Risk-free interest rate     1.49% 1.06% 1.38% 1.75%
Expected dividend yield     0.00% 0.00% 0.00% 0.00%
Expected warrant life (years)     5 years 2 years 11 months 27 days 3 years 6 months 4 years 6 months
Stock Price     $ 0.96 $ 2.35 $ 0.98 $ 1.80
Warrant [Member]            
Summary of assumptions used in connection with the valuation of warrants issued            
Number of shares underlying the warrants 5,059,438 5,309,438 5,416,851   4,723,357 5,309,438
Exercise price $ 1.65 $ 1.65 $ 0.61 0.61 $ 0.61 $ 1.65
Volatility 130.00% 135.00% 140.00%   128.00% 135.00%
Risk-free interest rate 1.25% 1.30% 1.49%   1.38% 1.75%
Expected dividend yield 0.00% 0.00% 0.00%   0.00% 0.00%
Expected warrant life (years) 3 years 10 months 24 days 4 years 4 months 24 days 5 years   3 years 6 months 4 years 6 months
Stock Price $ 2.05 $ 2.29 $ 0.96 $ 2.35 $ 0.98 $ 1.80
Exercised during 2015 [Member]            
Summary of assumptions used in connection with the valuation of warrants issued            
Number of shares underlying the warrants       1,679,286    
Exercise price       $ 0.61    
Expected dividend yield       0.00%    
Exercised during 2015 [Member] | Maximum [Member]            
Summary of assumptions used in connection with the valuation of warrants issued            
Volatility       119.00%    
Risk-free interest rate       1.06%    
Expected warrant life (years)       3 years 3 months 29 days    
Stock Price       $ 2.22    
Exercised during 2015 [Member] | Minimum [Member]            
Summary of assumptions used in connection with the valuation of warrants issued            
Volatility       117.00%    
Risk-free interest rate       0.81%    
Expected warrant life (years)       3 years 1 month 6 days    
Stock Price       $ 1.69