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Warrants (Schedule of Assumptions Used to Value Warrants) (Details) (Warrant [Member])
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Warrant [Member]
   
Assumptions used in valuing warrants:    
Volatility 72.00%  
Volatility, minimum   66.00%
Volatility, maximum   67.00%
Risk-free interest rate 0.54%  
Risk-free interest rate, minimum   0.31%
Risk-free interest rate, maximum   0.37%
Expected term 2 years 6 months 2 years 6 months