UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Contract revenue	$ 7,068,746	$ 3,742,525
Operating expenses:
Research and development	1,613,627	3,427,000
General and administrative	2,196,120	2,677,452
Restructuring expense	2,060,809
Depreciation	37,106	39,939
Total operating expenses	5,907,662	6,144,391
Income (loss) from operations	1,161,084	(2,401,866)
Other income (expense):
Interest expense, net	(25,325)	(69,872)
Change in fair value of derivative instruments	338,245	242,641
Other income	9,196	362
Total other income	322,116	173,131
Net income (loss) before income taxes	1,483,200	(2,228,735)
Income tax provision	(19,805)	(29,705)
Net income (loss)	1,463,395	(2,258,440)
Net income (loss) attributable to common stockholders	$ 1,277,017	$ (2,258,440)
Basic net income (loss) per share	$ 0.02	$ (0.04)
Diluted net income (loss) per share	$ 0.02	$ (0.04)
Weighted average shares used in calculation of basic net income (loss) per share	63,633,290	53,044,119
Weighted average shares used in calculation of diluted net income (loss) per share	63,979,859	53,044,119