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Warrant Liability (Details) (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 2008 [Member]
Dec. 31, 2011
Warrant agreement 2008 [Member]
Assumptions used for the black-scholes option pricing model              
Expected life (years)           1 year 10 months 24 days 2 years 4 months 24 days
Risk-free interest rate           0.30% 0.30%
Expected volatility           81.00% 74.10%
Expected dividend yield           0.00% 0.00%
Fair value of warrant liability $ 5,396,170   $ 5,396,170   $ 6,042,315 $ 1,552 $ 2,224
Change in fair value of warrant liability $ 6,205,957 $ 3,020,228 $ 1,264,780 $ 4,803,183   $ (672)