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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items]    
Volatility 91.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate 177.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Risk-free interest rate 1.30%us-gaap_FairValueAssumptionsRiskFreeInterestRate 0.60%us-gaap_FairValueAssumptionsRiskFreeInterestRate
Dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
Exercise price $ 0.14us-gaap_FairValueAssumptionsExercisePrice $ 0.14us-gaap_FairValueAssumptionsExercisePrice
Common stock closing price $ 0.21us-gaap_SharePrice $ 0.50us-gaap_SharePrice