CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2016	Apr. 03, 2015
Income Statement [Abstract]
Product	$ 57,644	$ 80,473
Services	24,188	23,543
Total net revenue	81,832	104,016
Product	27,189	35,460
Services	13,989	13,528
Total cost of revenue	41,178	48,988
Total gross profit	40,654	55,028
Operating expenses:
Research and development	23,563	22,329
Selling, general and administrative	32,870	31,196
Amortization of intangibles	2,365	1,446
Restructuring and related charges	2,612	44
Total operating expenses	61,410	55,015
(Loss) profit from operations	(20,756)	13
Interest (expense) income, net	(2,421)	55
Other expense, net	(9)	(506)
Loss on impairment of long-term investment	(1,476)	(2,505)
Loss before income taxes	(24,662)	(2,943)
Provision for (benefit from) income taxes	518	(286)
Net loss	$ (25,180)	$ (2,657)
Net loss per share:
Basic and diluted	$ (0.33)	$ (0.03)
Shares used in per share calculation:
Basic and diluted	76,996	88,655