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Warrant Liability (Details) (USD $)	3 Months Ended			3 Months Ended	12 Months Ended
Warrant Liability (Details) (USD $)	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)