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Warrant Liability (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assumptions used for the Black-Scholes option pricing model |  |  |
Expected life (years) | 6 years 4 months 24 days | 7 years 4 months 24 days | 7 years 2 months 12 days
Fair value of warrant liability | $ 9,265,365 | $ 6,042,315 |
Change in fair value of warrant liability | (5,944,571) | 6,612,092 | 3,005,040
Warrant agreement 2008 [Member] |  |  |
Assumptions used for the Black-Scholes option pricing model |  |  |
Expected life (years) | 1 year 4 months 24 days | 2 years 4 months 24 days |
Risk-free interest rate | 0.20% | 0.30% |
Expected volatility | 108.20% | 74.10% |
Expected dividend yield | 0.00% | 0.00% |
Fair value of warrant liability | 44,628 | 2,224 |
Change in fair value of warrant liability | $ 42,404 |  |

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