Fair Value Measurements - Schedule of Fair Value of Warrants (Details)	3 Months Ended
Mar. 31, 2017
October 2016 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	100.25%
Risk-free interest rates (in hundredths)	1.82%
Expected life (in years)	4 years 6 months 7 days
June 2016 Series C Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	98.67%
Risk-free interest rates (in hundredths)	1.93%
Expected life (in years)	5 years 2 months 16 days
July 2015 Series A Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	96.16%
Risk-free interest rates (in hundredths)	1.61%
Expected life (in years)	3 years 3 months 22 days
February 2015 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	95.91%
Risk-free interest rates (in hundredths)	1.50%
Expected life (in years)	2 years 10 months 17 days
October 2013 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	170.88%
Risk-free interest rates (in hundredths)	1.19%
Expected life (in years)	1 year 6 months 29 days

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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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
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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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- Definition

Risk-free interest rate assumption used in valuing an instrument.

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