Consolidated Statements of Comprehensive Loss (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Loss [Abstract]
Revenues	$ 11,012	$ 12,632	$ 31,297	$ 46,528
Cost of revenues	2,120	3,699	6,111	11,035
Gross profit	8,892	8,933	25,186	35,493
Operating expenses:
Selling and marketing	4,062	6,456	12,608	21,915
Research and development	5,845	10,696	19,122	33,692
General and administrative	5,011	5,876	15,664	20,039
Restructuring expense (income)	(19)	984	238	984
Goodwill and long-lived asset impairment		112,904		112,904
Total operating expenses	14,899	136,916	47,632	189,534
Operating loss	(6,007)	(127,983)	(22,446)	(154,041)
Non-operating income:
Change in fair value of contingent liability	1,210		1,210
Interest and other income, net	30	13	84	98
Loss before provision for income taxes	(4,767)	(127,970)	(21,152)	(153,943)
Provision for income tax expense (benefit)	46	6,511	168	(3,862)
Net loss	(4,813)	(134,481)	(21,320)	(150,081)
Other comprehensive income (loss), before tax:
Unrealized holding gains (losses) on available-for-sale securities	8	(48)	45	(49)
Income tax expense (benefit) related to items of other comprehensive income (expense)		(19)	6	(19)
Other comprehensive income (expense), net of tax	8	(29)	39	(30)
Comprehensive loss	$ (4,805)	$ (134,510)	$ (21,281)	$ (150,111)
Net loss per share:
Basic and diluted	$ (0.13)	$ (3.76)	$ (0.59)	$ (4.22)
Weighted average shares outstanding:
Basic and diluted	35,879	35,728	35,838	35,590