CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Contract revenue	$ 17,912,607	$ 25,175,887	$ 24,266,274
Operating expenses:
Research and development	15,290,142	19,509,629	21,219,853
General and administrative	13,279,186	11,628,732	14,311,079
Depreciation	182,487	303,916	461,073
Total operating expenses	28,751,815	31,442,277	35,992,005
Loss from operations	(10,839,208)	(6,266,390)	(11,725,731)
Other income (expenses):
Interest income	2,575	17,808	16,660
Interest expense	(369,281)	(342,561)	(54,573)
Gain on sale of assets held for sale			781,760
Realization of cumulative translation adjustment		1,227,656
Change in fair value of derivative instruments	(444,622)	591,039	7,144,983
Other income (expense)	(6,071)	47,862	39,328
Total other income (expenses)	(817,399)	1,541,804	7,928,158
Net loss before provision for income taxes	(11,656,607)	(4,724,586)	(3,797,573)
Provision for income taxes	(61,746)	(195,529)
Net loss	$ (11,718,353)	$ (4,920,115)	$ (3,797,573)
Basic and diluted net loss per share	$ (0.23)	$ (0.10)	$ (0.08)
Weighted average shares used in calculation of basic and diluted net loss per share	50,659,116	48,323,067	47,331,763