CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Total net revenue	[1]	$ 94,892	$ 115,725	$ 247,303	$ 280,696
Total cost of revenue		45,968	40,185	123,868	119,379
Total gross profit		48,924	75,540	123,435	161,317
Operating expenses:
Research and development		20,206	20,197	61,827	62,911
Selling, general and administrative		28,773	31,148	86,996	88,478
Amortization of intangibles		752	785	2,264	2,357
Restructuring and related charges		814	861	1,572	1,194
Total operating expenses		50,545	52,991	152,659	154,940
Income (loss) from operations		(1,621)	22,549	(29,224)	6,377
Interest expense, net		(2,807)	(3,000)	(8,772)	(8,862)
Loss on debt extinguishment		0	(5,695)	(834)	(5,695)
Other expense, net		(167)	(1,594)	(813)	(2,333)
Income (loss) before income taxes		(4,595)	12,260	(39,643)	(10,513)
Provision for income taxes		786	603	3,093	981
Net income (loss)		$ (5,381)	$ 11,657	$ (42,736)	$ (11,494)
Net income (loss) per share:
Basic		$ (0.06)	$ 0.13	$ (0.44)	$ (0.13)
Diluted		$ (0.06)	$ 0.12	$ (0.44)	$ (0.13)
Shares used in per share calculation:
Basic		97,563	89,964	96,623	89,030
Diluted		97,563	97,596	96,623	89,030
Appliance & Integration [Member]
Total net revenue		$ 63,251	$ 83,082	$ 153,227	$ 189,864
Total cost of revenue		32,082	26,812	81,153	83,178
SaaS & Service [Member]
Total net revenue		31,641	32,643	94,076	90,832
Total cost of revenue		$ 13,886	$ 13,373	$ 42,715	$ 36,201

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