Warrant Liabilities (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Warrants classified as liabilities	$ 3,133,743		$ 3,133,743		$ 3,972,230
Gain (loss) on warrant liabilities	2,933,707	(8,528,192)	838,487	(12,416,358)
Warrant [Member]
Derivative [Line Items]
Risk-free interest rate (in hundredths)			0.63%	0.54%
Expected dividend yield (in hundredths)			0.00%	0.00%
Expected lives			2 years 11 months 16 days	3 years 10 months 24 days
Expected volatility (in hundredths)			67.30%	86.30%
Warrants classified as liabilities	3,133,743	19,155,292	3,133,743	19,155,292
Gain (loss) on warrant liabilities	$ 2,900,000	$ (8,500,000)	$ 838,487	$ (12,416,358)