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Fair Value Measurements - Schedule of Fair Value of Warrants (Details) - 6 months ended Jun. 30, 2015
Total
February 2015 Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 87.83%
Risk-free interest rates (in hundredths) 1.55%
Expected life (in years) 4 years 7 months 21 days
2013 Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 90.83%
Risk-free interest rates (in hundredths) 1.09%
Expected life (in years) 3 years 3 months 29 days