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Warrant Liability (Tables) | 6 Months Ended
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Jun. 30, 2012
Warrant Liability [Abstract] |
Assumptions for Black-Scholes option pricing model |
|  | To Calculate Fair Value of Warrant Liability at |
|  | June 30, 2012 |  |  | December 31, 2011 |
Expected life (years) |  |  | 1.9 |  |  |  | 2.4 |
Risk-free interest rate |  |  | 0.3 | % |  |  | 0.3 | %
Expected volatility |  |  | 81.0 | % |  |  | 74.1 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At June 30, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2008 |  | $ | 1,552 |  |  | $ | 2,224 |  |  | $ | (672 | )
|  | To Calculate Fair Value of Warrant Liability at |
|  | June 30, 2012 |  |  | December 31, 2011 |
Expected life (years) |  |  | 2.8 |  |  |  | 3.3 |
Risk-free interest rate |  |  | 0.4 | % |  |  | 0.5 | %
Expected volatility |  |  | 73.5 | % |  |  | 90.8 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At June 30, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2009 |  | $ | 4,600 |  |  | $ | 28,971 |  |  | $ | (24,371 | )
Assumptions used for simulation model |
Risk-free interest rate per year |  |  | 0.6 | %
Expected volatility per year |  |  | 86.6 | %
Expected dividend yield |  |  | 0 | %
Expected life in years |  |  | 4.5 |
Summary of changes in fair value of warrant liability |
|  | Series A |  |  | Series B |
|  | Number of Warrants |  |  | Fair value $ |  |  | Number of Warrants |  |  | Fair value $ |
Balance at March 31, 2012 |  |  | 8,900,000 |  |  | $ | 6,234,984 |  |  |  | 7,100,000 |  |  | $ | 4,769,140 |
Add Issued |  |  | 1,800,000 |  |  |  | 1,106,618 |  |  |  | — |  |  |  | — |
Less exercised |  |  | — |  |  |  | — |  |  |  | (1,800,000 | ) |  |  | (527,799 | )
Less expired |  |  | — |  |  |  | — |  |  |  | (5,300,000 | ) |  |  | (3,560,063 | )
Changes in fair value |  |  | — |  |  |  | (1,951,584 | ) |  |  | — |  |  |  | (681,278 | )
Balance at June 30, 2012 |  |  | 10,700,000 |  |  | $ | 5,390,018 |  |  |  | — |  |  | $ | — |
Summary of outstanding warrants and fair value of warrant liability |
Warrants |  | Number Outstanding |  |  | Exercise Price $ |  |  | Fair value $ |
Warrants issued in 2008 |  |  | 1,034,483 |  |  |  | 23.00 |  |  |  | 1,552 |
Warrants issued in 2009 |  |  | 400,000 |  |  |  | 15.00 |  |  |  | 4,600 |
Series A Warrants |  |  | 10,700,000 |  |  |  | 1.40 |  |  |  | 5,390,018 |
Total |  |  | 12,134,483 |  |  |  |  |  |  |  | 5,396,170 |

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