CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Contract revenue	$ 1,149,570	$ 3,658,933	$ 8,218,316	$ 7,401,458
Operating expenses:
Research and development	1,222,527	2,372,687	2,836,154	5,799,687
General and administrative	1,819,241	$ 2,419,909	4,015,361	$ 5,097,361
Restructuring expense	35,982		2,096,791
Depreciation	36,687	$ 36,208	73,793	$ 76,147
Total operating expenses	3,114,437	4,828,804	9,022,099	10,973,195
Loss from operations	(1,964,867)	(1,169,871)	(803,783)	(3,571,737)
Other income (expense):
Interest expense, net	(13,279)	$ (56,554)	(38,604)	$ (126,426)
Realization of cumulative translation adjustment	(229,192)		(229,192)
Change in fair value of derivative instruments	(120,615)	$ 782,549	217,630	$ 1,025,190
Other income (expense)	(1,911)	(1,912)	7,285	(1,550)
Total other income (expense)	(364,997)	724,083	(42,881)	897,214
Net loss before income taxes	(2,329,864)	(445,788)	(846,664)	(2,674,523)
Income tax (provision) benefit	(11,068)	6,668	(30,873)	(23,037)
Net loss	$ (2,340,932)	$ (439,120)	$ (877,537)	$ (2,697,560)
Basic and diluted net loss per share	$ (0.04)	$ (0.01)	$ (0.01)	$ (0.05)
Weighted average shares used in calculation of basic and diluted net loss per share	63,745,834	54,670,870	63,691,214	53,861,988