Fair Value Measurements - Schedule of Fair Value of Warrants (Details)	3 Months Ended
Mar. 31, 2015
2015 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	89.08%
Risk-free interest rates (in hundredths)	1.31%
Expected life (in years)	4 years 10 months 17 days
2013 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	90.64%
Risk-free interest rates (in hundredths)	1.01%
Expected life (in years)	3 years 6 months 29 days
2012 Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Expected volatility (in hundredths)	76.58%
Risk-free interest rates (in hundredths)	0.03%
Expected life (in years)	2 months 1 day

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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 (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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.

+ References

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