Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Comprehensive Income [Abstract]
Revenues	$ 43,329	$ 57,767	$ 130,501
Cost of revenues	8,448	13,761	15,507
Gross profit	34,881	44,006	114,994
Operating expenses:
Selling and marketing	16,666	26,594	29,708
Research and development	24,767	41,711	42,759
General and administrative	20,211	25,279	24,146
Restructuring expenses	238	3,184
Goodwill and long-lived asset impairment		112,904
Total operating expenses	61,882	209,672	96,613
Operating income (loss)	(27,001)	(165,666)	18,381
Non-operating income:
Change in fair value of contingent liability	1,210
Interest and other income, net	94	131	130
Income (loss) before provision for income taxes	(25,697)	(165,535)	18,511
Provision for income tax expense (benefit)	(234)	(5,929)	6,165
Net income (loss)	(25,463)	(159,606)	12,346
Other comprehensive income (loss), before tax:
Unrealized holding gains (losses) on available-for-sale securities	33	(24)	(14)
Income tax expense (benefit) related to items of other comprehensive income (expense)	6	1	(6)
Other comprehensive income (expense), net of tax	27	(25)	(8)
Comprehensive income (loss)	$ (25,436)	$ (159,631)	$ 12,338
Net income (loss) per share:
Basic	$ (0.71)	$ (4.48)	$ 0.36
Diluted	$ (0.71)	$ (4.48)	$ 0.36
Weighted average shares outstanding:
Basic	35,849	35,617	34,204
Diluted	35,849	35,617	34,615