CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Total Net Revenue	[1]	$ 84,865	$ 99,160	$ 164,971	$ 189,287
Total cost of revenue		40,937	47,557	79,194	90,501
Total gross profit		43,928	51,603	85,777	98,786
Operating expenses:
Research and development		21,313	21,542	42,714	44,999
Selling, general and administrative		29,319	27,988	57,330	59,151
Amortization of intangibles		784	800	1,572	1,604
Restructuring and related charges		276	631	333	1,717
Total operating expenses		51,692	50,961	101,949	107,471
Income (loss) from operations		(7,764)	642	(16,172)	(8,685)
Interest expense, net		(2,956)	(2,863)	(5,862)	(5,620)
Other income (expense), net		(428)	199	(739)	(333)
Loss before income taxes		(11,148)	(2,022)	(22,773)	(14,638)
Provision for income taxes		697	891	378	1,969
Net loss		$ (11,845)	$ (2,913)	$ (23,151)	$ (16,607)
Net loss per share:
Basic and diluted		$ (0.13)	$ (0.03)	$ (0.26)	$ (0.20)
Shares used in per share calculation:
Basic and diluted		88,931	85,304	88,554	84,616
Appliance & Integration [Member]
Total Net Revenue		$ 54,417	$ 68,434	$ 106,782	$ 132,420
Total cost of revenue		29,312	36,662	56,366	67,238
SaaS & Service [Member]
Total Net Revenue		30,448	30,726	58,189	56,867
Total cost of revenue		$ 11,625	$ 10,895	$ 22,828	$ 23,263

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