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Warrant Liability (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended
Warrant Liability (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 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 7 months 6 days	2 years 4 months 24 days
Risk-free interest rate						0.20%	0.30%
Expected volatility						108.10%	74.10%
Expected dividend yield						0.00%	0.00%
Fair value of warrant liability	$ 14,483,148		$ 14,483,148		$ 6,042,315	$ 129,785	$ 2,224
Change in fair value of warrant liability	$ (11,239,465)	$ 1,697,194	$ (9,974,685)	$ 6,500,377		$ 127,561