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Warrants (Schedule of Assumptions Used to Value Warrants) (Details) (Warrant [Member])
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Warrant [Member]
   
Assumptions used in valuing warrants:    
Volatility    72.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Risk-free interest rate    0.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_WarrantMember
Expected term    2 years 6 months