Condensed Consolidated Statements Of Operations And Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Royalty and license	$ 9,085	$ 8,353
Product sales	272	1,001
Development contracts and other	334	414
Total revenues	9,691	9,768
Costs and expenses:
Cost of revenues (exclusive of amortization, impairment, and abandonment of intangibles shown separately below)	315	474
Sales and marketing	1,746	1,850
Research and development	2,194	2,099
General and administrative	4,771	3,111
Amortization, impairment, and abandonment of intangibles	341	357
Total costs and expenses	9,367	7,891
Operating income	324	1,877
Interest and other income	10	62
Income from continuing operations before provison for income taxes	334	1,939
Provision for income taxes	(553)	(594)
Income (loss) from continuing operations	(219)	1,345
Discontinued operations (Note 10) :
Gain on sales of discontinued operations net of provision for income taxes of $0 and $27	0	43
Net income (loss)	(219)	1,388
Basic net income (loss) per share
Continuing operations	$ (0.01)	$ 0.05
Discontinued operations	$ 0.00	$ 0.00
Total	$ (0.01)	$ 0.05
Shares used in calculating basic net income (loss) per share	27,941	28,249
Diluted net income (loss) per share
Continuing operations	$ (0.01)	$ 0.05
Discontinued operations	$ 0.00	$ 0.00
Total	$ (0.01)	$ 0.05
Shares used in calculating diluted net income (loss) per share	27,941	28,960
Other Comprehensive Income (loss)
Change in unrealized gains (losses) on short-term investments	(19)	4
Total Other Comprehensive Income (loss)	(19)	4
Total Comprehensive Income (loss)	$ (238)	$ 1,392