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Fair Value Measurements - Schedule of Fair Value of Warrants (Details)	6 Months Ended
	Jun. 30, 2017
October 2016 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	108.81%
Risk-free interest rates (in hundredths)	1.81%
Expected life (in years)	4 years 3 months 8 days
July 2015 Series A Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	104.84%
Risk-free interest rates (in hundredths)	1.55%
Expected life (in years)	3 years 22 days
February 2015 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	110.37%
Risk-free interest rates (in hundredths)	1.47%
Expected life (in years)	2 years 7 months 17 days
October 2013 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	201.39%
Risk-free interest rates (in hundredths)	1.27%
Expected life (in years)	1 year 3 months 29 days

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Risk-free interest rate assumption used in valuing an instrument.

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-Section 50
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