CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenue:
Revenues	$ 398,799	$ 385,961	$ 427,054
Costs and expenses:
Research and development	82,449	103,357	117,518
Selling, general, and administrative	91,054	90,718	98,602
Amortization of acquired intangible assets	17,690	31,340	33,575
Restructuring charges	17,349	7,196	9,267
Acquisition related charges	1,531	3,781	6,305
Impairment of acquired intangible assets	12,486	32,431	7,866
Gain on sale of building	0	(4,624)	0
Total costs and expenses	401,919	433,581	453,753
Loss from operations	(3,120)	(47,620)	(26,699)
Interest expense	(20,600)	(18,807)	(20,327)
Other (expense) income, net	(249)	(3,286)	2,844
Loss before income taxes	(23,969)	(69,713)	(44,182)
Income tax expense	2,353	849	9,917
Net loss	$ (26,322)	$ (70,562)	$ (54,099)
Net loss per share, basic and diluted (in dollars per share)	$ (0.21)	$ (0.58)	$ (0.45)
Shares used in per share calculations, basic and diluted (in shares)	126,564	122,677	119,994
Product
Revenue:
Revenues	$ 380,468	$ 356,502	$ 390,704
Costs and expenses:
Cost of product revenue	179,101	164,657	179,983
Licensing and services
Revenue:
Revenues	18,331	29,459	36,350
Costs and expenses:
Cost of product revenue	$ 259	$ 4,725	$ 637