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Stockholders' Equity (Details 5) - Warrants [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate, minimum 0.70%   0.90%
Risk-free interest rate, maximum 2.00%   1.80%
Risk free interest rate      
Dividend yield 0.00%   0.00%
Volatility, minimum 75.00%   73.00%
Volatility, maximum 76.00%   83.00%
Volatility      
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 7 years   7 years
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 4 years   4 years