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Fair Value Measurements - Schedule of Fair Value of Warrants (Details)
 6 Months Ended
Jun. 30, 2016
July 2015 Series A Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 94.42%
Risk-free interest rates (in hundredths) 0.86%
Expected life (in years) 4 years 1 month 6 days
June 2016 Series C Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 91.72%
Risk-free interest rates (in hundredths) 1.01%
Expected life (in years) 6 years
February 2015 Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 95.63%
Risk-free interest rates (in hundredths) 0.79%
Expected life (in years) 3 years 7 months 6 days
October 2013 Warrants [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Expected volatility (in hundredths) 84.96%
Risk-free interest rates (in hundredths) 0.61%
Expected life (in years) 2 years 3 months 18 days