Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
Income Statement [Abstract]
Product	$ 92,669	$ 88,223
Licensing and services	11,918	8,289
Total revenue	104,587	96,512
Costs and expenses:
Cost of product revenue	41,614	39,007
Cost of licensing and services revenue	2,141	401
Research and development	27,389	32,608
Selling, general, and administrative	23,905	23,608
Amortization of acquired intangible assets	8,514	8,721
Restructuring charges	66	5,431
Acquisition related charges	1,660	94
Total costs and expenses	105,289	109,870
Loss from operations	(702)	(13,358)
Interest expense	(5,568)	(4,960)
Other (expense) income, net	(148)	817
Loss before income taxes and equity in net loss of an unconsolidated affiliate	(6,418)	(17,501)
Income tax expense	518	1,900
Equity in net loss of an unconsolidated affiliate, net of tax	(339)	(310)
Net loss	$ (7,275)	$ (19,711)
Net loss per share, basic and diluted (in usd per shares)	$ (0.06)	$ (0.17)
Shares used in per share calculations, basic and diluted (in shares)	121,800	118,833