Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss before income taxes
United States	$ (87,458,000)	$ (61,730,000)	$ (30,399,000)
Foreign	(1,354,000)	(1,350,000)	(1,463,000)
Loss before income taxes	(88,812,503)	(63,079,941)	(31,862,454)
Income tax benefit
Foreign	(325,000)	(410,000)
Current Income Tax Expense (Benefit), Total	(325,000)	(410,000)
Significant component of U.S. deferred income tax expense (benefit)
Valuation allowance increase (decrease)	12,437,000
Provision for income taxes	(324,680)	(410,259)
U.S.
Significant component of U.S. deferred income tax expense (benefit)
Deferred tax (benefit) expense	(4,282,000)	(3,209,000)	10,661,000
Net operating loss carryforward (generated) expired	(8,974,000)	(6,536,000)	26,924,000
Valuation allowance increase (decrease)	13,256,000	9,745,000	(37,585,000)
Foreign
Significant component of U.S. deferred income tax expense (benefit)
Deferred tax (benefit) expense	194,000	1,406,000	(1,041,000)
Net operating loss carryforward (generated) expired	625,000	(15,000)	(79,000)
Valuation allowance increase (decrease)	$ (819,000)	$ (1,391,000)	$ 1,120,000