CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Income Statement [Abstract]
Product	$ 77,413	$ 77,447	$ 135,057	$ 157,920
Services	32,158	25,656	56,346	49,199
Total net revenue	109,571	103,103	191,403	207,119
Product	44,049	35,977	71,238	71,437
Services	14,482	12,741	28,471	26,269
Total cost of revenue	58,531	48,718	99,709	97,706
Total gross profit	51,040	54,385	91,694	109,413
Operating expenses:
Research and development	26,507	21,816	50,070	44,145
Selling, general and administrative	36,516	31,281	69,386	62,477
Amortization of intangibles	4,232	1,446	6,597	2,892
Restructuring and related charges	1,903	185	4,515	229
Total operating expenses	69,158	54,728	130,568	109,743
Loss from operations	(18,118)	(343)	(38,874)	(330)
Interest (expense) income, net	(2,651)	17	(5,072)	72
Other income (expense), net	332	59	323	(447)
Loss on impairment of long-term investment	0	0	(1,476)	(2,505)
Loss before income taxes	(20,437)	(267)	(45,099)	(3,210)
Provision for income taxes	242	727	760	441
Net loss	$ (20,679)	$ (994)	$ (45,859)	$ (3,651)
Net loss per share:
Basic and diluted	$ (0.27)	$ (0.01)	$ (0.59)	$ (0.04)
Shares used in per share calculation:
Basic and diluted	77,342	88,426	77,168	88,541