Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Revenue:
Revenue	$ 1,086	$ 12,335	$ 14,003	$ 30,925
Operating expenses:
Costs of services	344	843	1,518	2,128
Research and development expenses	4,388	6,801	16,179	19,236
General and administrative expenses	1,291	1,415	4,059	4,380
Total operating expenses	6,023	9,059	21,756	25,744
Operating income (loss)	(4,937)	3,276	(7,753)	5,181
Interest income	32	75	154	166
Interest expense		(13)		(200)
Other income (expense), net	(17)	32	58	297
Income (loss) from continuing operations before income taxes	(4,922)	3,370	(7,541)	5,444
Benefit from income taxes	2,018	1,765	2,018	1,765
Income (loss) from continuing operations	(2,904)	5,135	(5,523)	7,209
Income from discontinued operations, (net of tax provision of $2.0 million)	2,982		2,982
Net income (loss)	$ 78	$ 5,135	$ (2,541)	$ 7,209
Basic income (loss) per share
Continuing operations	$ (0.07)	$ 0.12	$ (0.13)	$ 0.16
Discontinued operations	$ 0.07		$ 0.07
Diluted income (loss) per share
Continuing operations	$ (0.07)	$ 0.12	$ (0.13)	$ 0.16
Discontinued operations	$ 0.07		$ 0.07
Basic weighted average shares outstanding	42,397	42,356	42,269	45,084
Diluted weighted average shares outstanding	42,397	42,538	42,269	45,304