Fair Value Measurements (Details 3)	3 Months Ended	0 Months Ended
Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Valuation technique for assets measured and recorded at fair value
Expected dividend yield (as a percent)	0.00%
Minimum
Valuation technique for assets measured and recorded at fair value
Risk-free interest rate (as a percent)		0.25%	0.21%
Volatility (as a percent)		107.98%	119.16%
Expected average term		1 year 2 months 1 day	1 year 5 months 1 day
Maximum
Valuation technique for assets measured and recorded at fair value
Risk-free interest rate (as a percent)		1.27%	1.35%
Volatility (as a percent)		129.60%	136.62%
Expected average term		3 years 9 months 18 days	4 years 15 days

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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

+ Details

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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

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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- Definition

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

+ References

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