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Fair Value of Financial Assets and Liabilities - Derivative Instruments (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Fair Value Assumptions and Methodology for Assets and Liabilities [Line Items] |  |
Volatility | 96.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | 91.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Expected term (years) | 1 year | 1 year 3 months
Risk-free interest rate | 0.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate | 0.36%us-gaap_FairValueAssumptionsRiskFreeInterestRate
Dividend yield | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
Exercise price | $ 0.14 us-gaap_FairValueAssumptionsExercisePrice | $ 0.14 us-gaap_FairValueAssumptionsExercisePrice
Common stock closing price | $ 0.30 us-gaap_SharePrice | $ 0.21 us-gaap_SharePrice

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- Definition Agreed upon price for the exchange of the underlying asset. + 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 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 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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock 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 Risk-free interest rate assumption used in valuing an instrument. + 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 Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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