Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Income Statement [Abstract]
Product	$ 390,704,000	$ 369,200,000	$ 366,127,000
Licensing and services	36,350,000	36,766,000	0
Total revenue	427,054,000	405,966,000	366,127,000
Costs and expenses:
Cost of product revenue	179,983,000	184,914,000	159,940,000
Cost of licensing and services revenue	637,000	1,143,000	0
Research and development	117,518,000	136,868,000	88,079,000
Selling, general, and administrative	98,602,000	97,349,000	73,527,000
Amortization of acquired intangible assets	33,575,000	29,580,000	2,948,000
Restructuring charges	9,267,000	19,239,000	17,000
Acquisition related charges	6,305,000	22,450,000	0
Impairment of goodwill and intangible assets	7,866,000	21,655,000	0
Costs and expenses	453,753,000	513,198,000	324,511,000
(Loss) income from operations	(26,699,000)	(107,232,000)	41,616,000
Interest expense	(20,327,000)	(18,389,000)	(172,000)
Other income (expense), net	4,303,000	(580,000)	1,497,000
(Loss) income before income taxes and equity in net loss of an unconsolidated affiliate	(42,723,000)	(126,201,000)	42,941,000
Income tax expense (benefit)	9,917,000	32,540,000	(5,639,000)
Equity in net loss of an unconsolidated affiliate, net of tax	(1,459,000)	(492,000)	0
Net (loss) income	$ (54,099,000)	$ (159,233,000)	$ 48,580,000
Net (loss) income per share
Basic net (loss) income per share (in dollars per share)	$ (0.45)	$ (1.36)	$ 0.41
Diluted net (loss) income per share (in dollars per share)	$ (0.45)	$ (1.36)	$ 0.40
Shares used in per share calculations:
Basic (in shares)	119,994	117,387	117,708
Diluted (in shares)	119,994	117,387	120,245