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Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2012
Warrant Liability [Abstract] |
Assumptions used for Black-Scholes option pricing model | The assumptions used for the Black-Scholes option pricing model are as follows:
|  | To Calculate Fair Value of Warrant Liability at December 31, |
|  | 2012 |  |  | 2011 |
Expected life (years) |  |  | 1.4 |  |  |  | 2.4 |
Risk-free interest rate |  |  | 0.2 | % |  |  | 0.3 | %
Expected volatility |  |  | 108.2 | % |  |  | 74.1 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At December 31, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability in Year 2012 |
Fair value of warrant liability |  | $ | 44,628 |  |  | $ | 2,224 |  |  | $ | 42,404 |
The assumptions used for the Black-Scholes option pricing model are as follows:
|  | To Calculate Fair Value of Warrant Liability at |
|  | December 31, 2012 |  |  | December 31, 2011 |
Expected life (years) |  |  | 2.3 |  |  |  | 3.3 |
Risk-free interest rate |  |  | 0.3 | % |  |  | 0.5 | %
Expected volatility |  |  | 94.5 | % |  |  | 90.8 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At December 31, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability in Year 2012 |
Fair value of warrant liability |  | $ | 63,340 |  |  | $ | 28,971 |  |  | $ | 34,369 |
Assumptions used for simulation model | The assumptions used for the Monte Carlo simulation model to value the outstanding Series A Warrants at December 31, 2012 are as follows:
Risk-free interest rate per year |  |  | 0.5 | %
Expected volatility per year |  |  | 86.0 | %
Expected dividend yield |  |  | 0 | %
Expected life (years) |  |  | 4.0 |
Summary of changes in fair value of warrant liability | The following table is a summary of the changes in fair value of warrant liability for the Series A and Series B Warrants in 2012:
|  | Series A |  |  | Series B |
|  | Number of Warrants |  |  | Fair value $ |  |  | Number of Warrants |  |  | Fair value $ |
Balance at December 31, 2011 |  |  | 8,000,000 |  |  | $ | 3,790,160 |  |  |  | 8,000,000 |  |  | $ | 2,220,960 |
Add issued |  |  | 2,700,000 |  |  |  | 1,714,436 |  |  |  | — |  |  |  | — |
Less exercised |  |  | (2,198,571 | ) |  |  | (3,340,155 | ) |  |  | (2,700,000 | ) |  |  | (1,095,802 | )
Less expired |  |  | — |  |  |  | — |  |  |  | (5,300,000 | ) |  |  | — |
Changes in fair value |  |  | — |  |  |  | 6,992,956 |  |  |  | — |  |  |  | (1,125,158 | )
Balance at December 31, 2012 |  |  | 8,501,429 |  |  | $ | 9,157,397 |  |  |  | — |  |  | $ | — |
Summary of outstanding warrants and fair value of warrant liability | The following table is a summary of our outstanding warrants and fair value of our warrant liability as of December 31, 2012:
Warrants |  | Number Outstanding |  |  | Exercise Price ($) per share |  |  | Fair value |
Warrants issued in 2008 |  |  | 1,034,483 |  |  |  | 23.00 |  |  | $ | 44,628 |
Warrants issued in 2009 |  |  | 400,000 |  |  |  | 15.00 |  |  |  | 63,340 |
Series A Warrants |  |  | 8,501,429 |  |  |  | 1.40 |  |  |  | 9,157,397 |
Total |  |  | 9,935,912 |  |  |  |  |  |  | $ | 9,265,365 |

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