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7. Derivative liability (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2011
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| Derivative [Line Items] | ||
| Fair value of derivative liabilities | $ 3,221,138 | $ 1,643,139 |
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Warrant [Member]
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| Derivative [Line Items] | ||
| Risk-free interest rate | 0.02% | 0.12% |
| Expected volatility | 165.00% | 92.00% |
| Expected life (in years) | .04 | 0.75-1.00 |
| Expected dividend yield | 0.00% | 0.00% |
| Fair value of derivative liabilities | 3,221,138 | 1,643,139 |
| Number of warrants | 4,412,500 | |
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2009 Summer Warrants [Member]
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| Derivative [Line Items] | ||
| Fair value of derivative liabilities | 332,998 | |
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2009 Wellfleet Warrants [Member]
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| Derivative [Line Items] | ||
| Fair value of derivative liabilities | 17,807 | |
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2009 Fall Warrants [Member]
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| Derivative [Line Items] | ||
| Fair value of derivative liabilities | $ 3,221,138 | $ 1,292,334 |
| Number of warrants | 4,412,500 | |
| X | ||||||||||
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- Definition
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Expected life (in years) No definition available.
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