STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Contract revenue	$ 7,103	$ 3,001	$ 11,745	$ 3,835
Costs and expenses:
Cost of contract revenue	5,118	1,231	8,903	1,574
Research and development	5,176	4,353	10,254	9,424
General and administrative	2,664	3,338	5,910	6,188
Total costs and expenses	12,958	8,922	25,067	17,186
Loss from operations	(5,855)	(5,921)	(13,322)	(13,351)
Other income (expense):
Interest income	39	38	72	84
Interest expense	(3)	(2)	(6)	(4)
Change in fair value of warrant liability	(101)	1,304	0	1,237
Loss from operations before income tax	(5,920)	(4,581)	(13,256)	(12,034)
Income tax expense		412		412
Net loss	$ (5,920)	$ (4,993)	$ (13,256)	$ (12,446)
Basic and diluted net loss per share	$ (0.05)	$ (0.04)	$ (0.11)	$ (0.11)
Basic and diluted weighted average number of common shares outstanding	126,925	112,821	123,741	112,009