CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 29, 2019	Mar. 30, 2018
Total Net Revenue	[1]	$ 80,106	$ 90,127
Total cost of revenue		38,257	42,944
Total gross profit		41,849	47,183
Operating expenses:
Research and development		21,401	23,457
Selling, general and administrative		28,011	31,163
Amortization of intangibles		788	804
Restructuring and related charges		57	1,086
Total operating expenses		50,257	56,510
Loss from operations		(8,408)	(9,327)
Interest expense, net		(2,906)	(2,757)
Other expense, net		(311)	(532)
Loss before income taxes		(11,625)	(12,616)
Provision for (benefit from) income taxes		(319)	1,078
Net loss		$ (11,306)	$ (13,694)
Net loss per share:
Basic and diluted		$ (0.13)	$ (0.16)
Shares used in per share calculation:
Basic and diluted		88,165	83,912
Appliance & Integration [Member]
Total Net Revenue		$ 52,365	$ 63,986
Total cost of revenue		27,054	30,576
SaaS & Service [Member]
Total Net Revenue		27,741	26,141
Total cost of revenue		$ 11,203	$ 12,368

[1] Revenue is attributed to countries based on the location of the customer.