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Warrant Liability (Tables) | 9 Months Ended
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Sep. 30, 2012
Warrant Liability [Abstract] |
Assumptions used for Black-Scholes option pricing model |
|  | To Calculate Fair Value of Warrant Liability at |
|  | September 30, 2012 |  |  | December 31, 2011 |
Expected life (years) |  |  | 1.6 |  |  |  | 2.4 |
Risk-free interest rate |  |  | 0.2 | % |  |  | 0.3 | %
Expected volatility |  |  | 108.1 | % |  |  | 74.1 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At September 30, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2008 |  | $ | 129,785 |  |  | $ | 2,224 |  |  | $ | 127,561 |
|  | To Calculate Fair Value of Warrant Liability at |
|  | September 30, 2012 |  |  | December 31, 2011 |
Expected life (years) |  |  | 2.6 |  |  |  | 3.3 |
Risk-free interest rate |  |  | 0.3 | % |  |  | 0.5 | %
Expected volatility |  |  | 90.1 | % |  |  | 90.8 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At September 30, 2012 |  |  | At December 31, 2011 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2009 |  | $ | 104,703 |  |  | $ | 28,971 |  |  | $ | 75,732 |
Assumptions used for simulation model |
Risk-free interest rate per year |  |  | 0.5 | %
Expected volatility per year |  |  | 95.3 | %
Expected dividend yield |  |  | 0 | %
Expected life in years |  |  | 4.2 |
Summary of changes in fair value of warrant liability |
|  | Series A |
|  | Number of Warrants |  |  | Fair value $ |
Balance at June 30, 2012 |  |  | 10,700,000 |  |  | $ | 5,390,018 |
Less exercised |  |  | (1,445,400 | ) |  |  | (728,106 | )
Changes in fair value |  |  | — |  |  |  | 9,586,748 |
Balance at September 30, 2012 |  |  | 9,254,600 |  |  | $ | 14,248,660 |
Summary of outstanding warrants and fair value of warrant liability |
Warrants |  | Number Outstanding |  |  | Exercise Price ($) per share |  |  | Fair value |
Warrants issued in 2008 |  |  | 1,034,483 |  |  |  | 23.00 |  |  | $ | 129,785 |
Warrants issued in 2009 |  |  | 400,000 |  |  |  | 15.00 |  |  |  | 104,703 |
Series A Warrants |  |  | 9,254,660 |  |  |  | 1.40 |  |  |  | 14,248,660 |
Total |  |  | 10,689,143 |  |  |  |  |  |  | $ | 14,483,148 |

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