CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Total net revenue	[1]	$ 73,994	$ 84,865	$ 152,411	$ 164,971
Total cost of revenue		36,221	40,937	77,900	79,194
Total gross profit		37,773	43,928	74,511	85,777
Operating expenses:
Research and development		19,498	21,313	41,621	42,714
Selling, general and administrative		27,005	29,319	58,223	57,330
Amortization of intangibles		742	784	1,512	1,572
Restructuring and related charges		82	276	758	333
Total operating expenses		47,327	51,692	102,114	101,949
Loss from operations		(9,554)	(7,764)	(27,603)	(16,172)
Interest expense, net		(3,062)	(2,956)	(5,965)	(5,862)
Loss on debt extinguishment		(834)		(834)	0
Other expense, net		(373)	(428)	(646)	(739)
Loss before income taxes		(13,823)	(11,148)	(35,048)	(22,773)
Provision for income taxes		1,578	697	2,307	378
Net loss		$ (15,401)	$ (11,845)	$ (37,355)	$ (23,151)
Net loss per share:
Basic and Diluted		$ (0.16)	$ (0.13)	$ (0.39)	$ (0.26)
Shares used in per share calculation:
Basic and Diluted		96,727	88,931	96,255	88,554
Appliance & Integration [Member]
Total net revenue		$ 42,224	$ 54,417	$ 89,976	$ 106,782
Total cost of revenue		22,784	29,312	49,071	56,366
SaaS & Service [Member]
Total net revenue		31,770	30,448	62,435	58,189
Total cost of revenue		$ 13,437	$ 11,625	$ 28,829	$ 22,828

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