CONDENSED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Product sales	$ 331	$ 99	$ 498	$ 99
Cost of goods sold	139	34	209	34
Gross profit	192	65	289	65
Revenue from collaborative research agreements, government contract and royalties	10,242	10,659	30,861	32,340
Operating expenses:
Research and development	5,018	5,460	14,938	18,476
General and administrative	1,429	1,268	6,405	4,677
Total operating expenses	6,447	6,728	21,343	23,153
Income from operations	3,987	3,996	9,807	9,252
Other income, net	26	27	80	151
Income before income taxes	4,013	4,023	9,887	9,403
Income tax benefit (expense)		525	(43)	(692)
Net income	$ 4,013	$ 4,548	$ 9,844	$ 8,711
Basic earnings per share (in dollars per share)	$ 0.12	$ 0.14	$ 0.30	$ 0.27
Diluted earnings per share (in dollars per share)	$ 0.12	$ 0.14	$ 0.30	$ 0.26
Weighted average common shares (basic) (in shares)	32,826	32,789	32,818	32,781
Weighted average common shares (diluted) (in shares)	33,121	33,100	33,121	33,095