Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Revenue	$ 84,694	$ 70,792	$ 155,852	$ 142,492
Costs and expenses:
Cost of products sold	39,584	33,741	72,587	65,956
Research and development	20,267	19,363	38,381	38,509
Selling, general and administrative	17,072	19,405	33,570	37,328
Acquisition related charges, including amortization of intangible assets	737	982	1,486	2,689
Restructuring charges	19	87	172	643
Costs and expenses	77,679	73,578	146,196	145,125
Income (loss) from operations	7,015	(2,786)	9,656	(2,633)
Other (expense) income, net	(54)	694	(106)	758
Income (loss) before income taxes	6,961	(2,092)	9,550	(1,875)
Provision for income taxes	1,921	10,450	2,620	18,381
Net Income (loss)	5,040	(12,542)	6,930	(20,256)
Net Income (loss) per share:
Basic (in dollars per share)	$ 0.04	$ (0.11)	$ 0.06	$ (0.17)
Diluted (in dollars per share)	$ 0.04	$ (0.11)	$ 0.06	$ (0.17)
Shares used in per share calculations:
Basic (in shares)	115,733	117,874	115,562	118,024
Diluted (in shares)	117,109	117,874	116,935	118,024
Comprehensive Income (loss)
Net Income (loss)	5,040	(12,542)	6,930	(20,256)
Other comprehensive income:
Unrealized (loss) gain related to marketable securities, net	(84)	43	(232)	(22)
Less: reclassification adjustment for losses included in other (expense) income, net	229	(78)	302	(78)
Translation adjustment	(265)	104	(430)	259
Comprehensive Income (loss)	$ 4,920	$ (12,473)	$ 6,570	$ (20,097)