CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Contract revenue	$ 24,266,274	$ 20,993,605
Revenues, Total	24,266,274	20,993,605
Operating expenses:
Research and development	21,219,853	20,875,536
General and administrative	14,311,079	18,015,761
Depreciation and amortization (including $4,635,489 impairment charges in 2010)	461,073	5,655,865
Total operating expenses	35,992,005	44,547,162
Loss from operations	(11,725,731)	(23,553,557)
Other income (expenses):
Interest income	16,660	6,955
Interest expense	(54,573)	(5,936,480)
Gain on sale of assets held for sale	781,760
Other income (expense)	39,328	91,355
Change in market value of derivative instruments	7,144,983	(5,457,550)
Total other income (expenses)	7,928,158	(11,295,720)
Net loss	$ (3,797,573)	$ (34,849,277)
Basic and diluted net loss per share	$ (0.08)	$ (1.08)
Weighted average shares used in calculation of basic and diluted net loss per share	47,331,763	32,309,621