Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Income Statement [Abstract]
Product	$ 98,572	$ 86,570	$ 280,587	$ 282,527
Licensing and services	11,143	0	24,185
Total revenue	109,715	86,570	304,772	282,527
Costs and expenses:
Cost of product revenue	49,415	35,759	138,250	122,603
Cost of licensing and services revenue	451	0	715
Research and development	37,619	22,053	104,813	65,594
Selling, general, and administrative	23,819	17,645	73,096	55,226
Acquisition related charges	610	0	22,078	0
Restructuring charges	6,818	2	15,780	16
Amortization of acquired intangible assets	8,941	737	20,824	2,211
Costs and Expenses	127,673	76,196	375,556	245,650
(Loss) income from operations	(17,958)	10,374	(70,784)	36,877
Interest expense	(5,754)	0	(12,870)	(48)
Other (expense) income, net	(943)	53	(1,298)	1,316
(Loss) income before income taxes	(24,655)	10,427	(84,952)	38,145
Income tax expense	309	1,021	29,030	4,984
Net (loss) income	(24,964)	9,406	(113,982)	33,161
Less: Net loss attributable to noncontrolling interest	102	0	203	0
Net (loss) income attributable to common stockholders	$ (24,862)	$ 9,406	$ (113,779)	$ 33,161
Net (loss) income per share:
Basic (in dollars per share)	$ (0.21)	$ 0.08	$ (0.97)	$ 0.28
Diluted (in dollars per share)	$ (0.21)	$ 0.08	$ (0.97)	$ 0.28
Shares used in per share calculations:
Basic (in shares)	117,669	118,643	117,151	117,661
Diluted (in shares)	117,669	120,970	117,151	120,449