CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Contract revenue	$ 1,005,694	$ 7,068,746
Operating expenses:
Research and development	1,029,131	1,613,627
General and administrative	1,193,298	2,196,120
Restructuring expense	0	2,060,809
Depreciation	37,701	37,106
Total operating expenses	2,260,130	5,907,662
(Loss) income from operations	(1,254,436)	1,161,084
Other income (expense):
Interest expense, net	(1,050)	(25,325)
Change in fair value of derivative instruments	39,898	338,245
Other income	4,119	9,196
Total other income	42,967	322,116
Net (loss) income before income taxes	(1,211,469)	1,483,200
Income tax provision	(15,437)	(19,805)
Net (loss) income	$ (1,226,906)	$ 1,463,395
Basic net (loss) income per share (in dollar per share)	$ (0.02)	$ 0.02
Diluted net (loss) income per share (in dollar per share)	$ (0.02)	$ 0.02
Weighted average shares used in calculation of basic net (loss) income per share	64,404,396	63,633,290
Weighted average shares used in calculation of diluted net (loss) income per share	64,404,396	63,979,859