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Warrant Liability (Details 1) (USD $)
 3 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Warrant agreement 2009 [Member]
Sep. 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 7 months 6 days 3 years 3 months 18 days
Risk-free interest rate             0.30% 0.50%
Expected volatility             90.10% 90.80%
Expected dividend yield             0.00% 0.00%
Fair value of warrant liability $ 14,483,148   $ 14,483,148   $ 6,042,315   $ 104,703 $ 28,971
Change in fair value of warrant liability $ (11,239,465) $ 1,697,194 $ (9,974,685) $ 6,500,377   $ 75,732