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10. Fair Value of Warrants | 12 Months Ended
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Dec. 31, 2012
Notes to Financial Statements |
10. Fair Value of Warrants | 10. Fair Value of Warrants The following tables summarize the assumptions used in computing the fair value of liability warrants subject to fair value accounting at the date of issue during the year ended December 31, 2012:
Expected dividend yield |  |  | 0% |
Risk-free interest rate |  |  | 0.67% - 0.86% |
Expected volatility |  |  | 79.08% - 119.03% |
Expected Life (years) |  |  | 5.0 |
Exercise price |  | $ | 0.001 |
Company stock price |  | $ | 0.40 - $0.73 |
The following tables summarize the assumptions used in computing the fair value of liability warrants subject to fair value accounting at December 31, 2012:
Expected dividend yield |  |  | 0% |
Risk-free interest rate |  |  | 0.72% |
Expected volatility |  |  | 79.08% |
Expected Life (years) |  |  | 4.5-5.0 |
Exercise price |  | $ | 0.001 |
Company stock price |  | $ | 0.70 |

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