Warrant Liabilities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Gain (loss) on warrant liabilities	$ (4,010,811)	$ 6,436,342	$ (3,172,324)	$ (5,980,016)
Warrant [Member]
Derivative [Line Items]
Risk-free interest rate (in hundredths)			0.59%	0.44%
Expected dividend yield (in hundredths)			0.00%	0.00%
Expected lives			2 years 8 months 16 days	3 years 7 months 24 days
Expected volatility (in hundredths)			66.70%	80.40%
Gain (loss) on warrant liabilities	$ (4,000,000)	$ 6,400,000	$ (3,172,324)	$ (5,980,016)