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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ 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

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

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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.

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Fair Value (Details 3)	12 Months Ended	0 Months Ended			12 Months Ended	0 Months Ended
Fair Value (Details 3)	Dec. 31, 2014	Jan. 20, 2014	Feb. 20, 2013	Feb. 20, 2013	Dec. 31, 2013	May 31, 2011
Valuation technique for assets measured and recorded at fair value
Expected dividend yield (as a percent)	0.00%
Common stock warrants issued on January 20, 2014
Valuation technique for assets measured and recorded at fair value
Risk-free interest rate (as a percent)	1.35%	1.65%
Volatility (as a percent)	119.20%	107.60%
Expected average term	4 years	5 years
Common stock warrants issued on February 20, 2013
Valuation technique for assets measured and recorded at fair value
Risk-free interest rate (as a percent)	1.06%		0.85%		1.14%
Volatility (as a percent)	126.20%			102.00%	99.00%
Expected average term	3 years 1 month 6 days		5 years		4 years 1 month 6 days
Common stock warrants issued on May 31, 2011
Valuation technique for assets measured and recorded at fair value
Risk-free interest rate (as a percent)	0.21%				0.52%	0.75%
Volatility (as a percent)	136.60%				119.30%	94.40%
Expected average term	1 year 4 months 24 days				2 years 4 months 24 days	2 years 4 months 24 days