Warrant Liabilities (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Warrants classified as liabilities	$ 6,067,450		$ 3,972,230
Loss on warrant liabilities	(2,095,220)	(3,888,166)
Warrant [Member]
Derivative [Line Items]
Risk-free interest rate (in hundredths)	0.45%	0.74%
Expected dividend yield (in hundredths)	0.00%	0.00%
Expected lives	3 years 2 months 16 days	4 years 1 month 24 days
Expected volatility (in hundredths)	0.69%	0.892%
Warrants classified as liabilities	6,067,450	3,972,230
Loss on warrant liabilities	$ (2,095,220)	$ (3,888,166)