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Warrant Liability (Details 1) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Warrant agreement 2009 [Member] | Dec. 31, 2011 Warrant agreement 2009 [Member]
Assumptions used for the black-scholes option pricing model |  |  |  |  |  |  |
Expected life (years) |  |  |  |  |  | 2 years 9 months 18 days | 3 years 3 months 18 days
Risk-free interest rate |  |  |  |  |  | 0.40% | 0.50%
Expected volatility |  |  |  |  |  | 73.50% | 90.80%
Expected dividend yield |  |  |  |  |  | 0.00% | 0.00%
Fair value of warrant liability | $ 5,396,170 |  | $ 5,396,170 |  | $ 6,042,315 | $ 4,600 | $ 28,971
Change in fair value of warrant liability | $ 6,205,957 | $ 3,020,228 | $ 1,264,780 | $ 4,803,183 |  | $ (24,371) |

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