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Stockholders' Equity (Details 4) (Warrant [Member], USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Current price of common stock $ 2.00   $ 0.30
Risk-free interest rate, minimum 0.70% 0.90% 0.60%
Risk-free interest rate, maximum 2.00% 1.80% 0.70%
Dividend yield 0.00% 0.00% 0.00%
Volatility, minimum 75.00% 73.00% 82.00%
Volatility, maximum 76.00% 83.00% 83.00%
Expected term (in years)     5 years
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Current price of common stock   1.50  
Expected term (in years) 7 years 7 years  
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Current price of common stock   0.80  
Expected term (in years) 4 years 4 years