CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Royalty revenue	$ 20,594	$ 16,971
Development and license revenue	1,430	127
Total revenues	22,024	17,098
Operating expenses:
Research and development	14,065	7,992
General and administrative	4,342	3,621
Amortization of intangibles	2,157
Total operating expenses	20,564	11,613
Income from operations	1,460	5,485
Interest income	41	49
Other income (expense)	(44)
Income before income taxes	1,457	5,534
Income tax benefit (provision)	2,783	(44)
Net income	$ 4,240	$ 5,490
Net income per common share:
Basic (in dollars per share)	$ 0.05	$ 0.09
Diluted (in dollars per share)	$ 0.04	$ 0.09
Weighted average shares outstanding:
Basic (in shares)	93,072	60,364
Diluted (in shares)	103,988	61,026