Consolidated Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Royalty and license	$ 28,989	$ 26,916	$ 23,250
Product sales	1,982	2,583	6,803
Development contracts and other	1,198	1,136	1,071
Total revenues	32,169	30,635	31,124
Costs and expenses:
Cost of revenues (exclusive of amortization, impairment, and abandonment of intangibles shown separately below)	1,188	1,255	2,901
Sales and marketing	6,775	7,085	8,033
Research and development	8,421	8,386	8,738
General and administrative	19,326	12,568	15,043
Amortization, impairment, and abandonment of intangibles	1,554	1,394	1,237
Total costs and expenses	37,264	30,688	35,952
Operating loss	(5,095)	(53)	(4,828)
Interest and other income	170	204	272
Income (loss) from continuing operations before provision for income taxes	(4,925)	151	(4,556)
Provision for income taxes	(792)	(1,816)	(1,501)
Loss from continuing operations	(5,717)	(1,665)	(6,057)
Discontinued operations (Note 11):
Gain on sales of discontinued operations, net of provision for income taxes of $97, $39 and $65, respectively	153	61	130
Net loss	(5,564)	(1,604)	(5,927)
Basic and diluted net loss per share:
Continuing operations	$ (0.21)	$ (0.06)	$ (0.22)
Discontinued operations	$ 0.01	$ 0.00	$ 0.01
Total	$ (0.20)	$ (0.06)	$ (0.21)
Shares used in calculating basic and diluted net loss per share	27,735	28,564	28,113
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on available-for-sale securities arising during period	(9)	(2)	54
Total other comprehensive income (loss)	(9)	(2)	54
Total comprehensive loss	$ (5,573)	$ (1,606)	$ (5,873)