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7. Derivative liability (Tables) | 12 Months Ended
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Dec. 31, 2012
Derivative Liability |
The derivative liabilities were valued using a probability weighted average series of Black-Scholes-Merton models |
|  |  |  |  | Fair Value of Warrants |
|  | No. of Warrants |  |  | December 31, 2011 |  |  | 2012 Issuance |  | December 31, 2012 |
Risk-free interest rate |  |  |  |  | 0.12% |  |  | – |  | 0.02% |
Expected volatility |  |  |  |  | 92% |  |  | – |  | 165% |
Expected life (in years) |  |  |  |  | 0.75 – 1.00 |  |  | – |  | 0.04 |
Expected dividend yield |  |  |  |  | 0% |  |  | – |  | 0% |
Fair Value: |  |  |  |  |  |  |  |  |  |  |  |  |  |
2009 Summer Warrants |  |  | – |  |  | $ | 332,998 |  |  |  | – |  | $ | – |
2009 Wellfleet Warrants |  |  | – |  |  |  | 17,807 |  |  |  | – |  |  | – |
2009 Fall Warrants |  |  | 4,412,500 |  |  |  | 1,292,334 |  |  | $ | – |  |  | 3,221,138 |
Total Fair Value |  |  | 4,412,500 |  |  | $ | 1,643,139 |  |  | $ | – |  | $ | 3,221,138 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, used to measure similar assets in prior periods (non-recurring basis) by class of asset or liability. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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