CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Royalty revenue	$ 11,539	$ 9,764	$ 28,510	$ 24,057
Development and license revenue	127	127	254	254
Total revenues	11,666	9,891	28,764	24,311
Operating expenses:
Research and development	7,992	7,269	15,985	14,705
General and administrative	3,532	2,407	7,152	4,768
Gain on sale of products	(700)	(700)	(700)	(700)
Total operating expenses	10,824	8,976	22,437	18,773
Income from operations	842	915	6,327	5,538
Interest income	57	46	106	97
Other income	10		10
Income before income tax provision	909	961	6,443	5,635
Income tax provision	(6)		(50)
Net income	$ 903	$ 961	$ 6,393	$ 5,635
Net income per common share:
Basic (in dollars per share)	$ 0.01	$ 0.02	$ 0.11	$ 0.09
Diluted (in dollars per share)	$ 0.01	$ 0.02	$ 0.10	$ 0.09
Weighted average shares outstanding:
Basic (in shares)	60,399	60,293	60,382	60,251
Diluted (in shares)	61,070	60,770	61,044	60,752