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Warrant Liability (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Warrant agreement 2008 [Member] | Dec. 31, 2012 Warrant agreement 2008 [Member]
Assumptions used for the Black-Scholes option pricing model |  |  |  |  |
Expected life (years) |  |  |  | 1 year 1 month 6 days | 1 year 4 months 24 days
Risk-free interest rate |  |  |  | 0.20% | 0.20%
Expected volatility |  |  |  | 100.10% | 108.20%
Expected dividend yield |  |  |  | 0.00% | 0.00%
Fair value of warrant liability | $ 9,035,131 |  | $ 9,265,365 | $ 14,752 | $ 44,628
Change in fair value of warrant liability | $ (188,607) | $ (4,941,177) |  | $ (29,876) |

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