Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Royalty and license	$ 13,649	$ 9,085
Product sales	19	272
Development contracts and other	192	334
Total revenues	13,860	9,691
Costs and expenses:
Cost of revenues (exclusive of amortization, abandonment, and impairment of intangibles shown separately below)	148	315
Sales and marketing	2,247	1,746
Research and development	2,573	2,194
General and administrative	6,138	4,771
Amortization, abandonment, and impairment of intangibles	494	341
Total costs and expenses	11,600	9,367
Operating income	2,260	324
Interest and other income	10	10
Income before provision for income taxes	2,270	334
Provision for income taxes	(17)	(553)
Net income (loss)	2,253	(219)
Basic net income (loss) per share	$ 0.08	$ (0.01)
Shares used in calculating basic net income (loss) per share	27,424	27,941
Diluted net income (loss) per share	$ 0.08	$ (0.01)
Shares used in calculating diluted net income (loss) per share	28,294	27,941
Other comprehensive loss
Change in unrealized gains (losses) on short-term investments	(3)	(19)
Total other comprehensive loss	(3)	(19)
Total comprehensive income (loss)	$ 2,250	$ (238)