Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Income Statement [Abstract]
Product	$ 88,223	$ 85,715
Licensing and services	8,289	2,882
Total revenue	96,512	88,597
Costs and expenses:
Cost of product revenue	39,007	40,672
Cost of licensing and services revenue	401	93
Research and development	32,608	27,642
Selling, general, and administrative	23,608	21,088
Amortization of acquired intangible assets	8,721	2,942
Restructuring charges	5,431	4,894
Acquisition related charges	94	18,198
Costs and Expenses	109,870	115,529
Loss from operations	(13,358)	(26,932)
Interest expense	(4,960)	(1,611)
Other income (expense), net	817	(139)
Loss before income taxes and equity in net loss of an unconsolidated affiliate	(17,501)	(28,682)
Income tax expense	1,900	24,665
Equity in net loss of an unconsolidated affiliate, net of tax	(310)	0
Net loss	$ (19,711)	$ (53,347)
Net loss per share:
Net loss per share, basic and diluted (in usd per shares)	$ (0.17)	$ (0.46)
Shares used in per share calculations:
Shares used in per share calculations, basic and diluted (in shares)	118,833	116,863