Warrant Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Gain (Loss) on warrant liabilities	$ 4,437,628	$ 19,051,239	$ (20,210,094)
Warrant [Member]
Derivative [Line Items]
Risk-free interest rate	0.57%	0.46%
Expected dividend yield	0.00%	0.00%	0.00%
Expected lives	7 months 2 days	1 year 7 months 2 days
Expected volatility	61.70%	89.70%
Number of warrants classified as liabilities (in shares)	6,371,854	6,371,854	6,984,716
Gain (Loss) on warrant liabilities	$ 4,437,628	$ 19,051,239	$ (20,210,094)
Warrant [Member] | Minimum [Member]
Derivative [Line Items]
Risk-free interest rate			0.13%
Expected lives			11 months 12 days
Expected volatility			83.40%
Warrant [Member] | Maximum [Member]
Derivative [Line Items]
Risk-free interest rate			0.58%
Expected lives			2 years 7 months 2 days
Expected volatility			95.30%