CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Total net revenue	$ 99,160	$ 82,315	$ 189,287	$ 165,258
Total cost of revenue	47,557	48,500	90,501	91,035
Total gross profit	51,603	33,815	98,786	74,223
Operating expenses:
Research and development	21,542	27,055	44,999	51,937
Selling, general and administrative	27,988	32,625	59,151	67,256
Amortization of intangibles	800	780	1,604	1,554
Restructuring and related charges	631	777	1,717	2,056
Total operating expenses	50,961	61,237	107,471	122,803
Income (loss) from operations	642	(27,422)	(8,685)	(48,580)
Interest expense, net	(2,863)	(2,680)	(5,620)	(5,270)
Other income (expense), net	199	(819)	(333)	(1,330)
Loss before income taxes	(2,022)	(30,921)	(14,638)	(55,180)
Provision for income taxes	891	579	1,969	347
Net loss	$ (2,913)	$ (31,500)	$ (16,607)	$ (55,527)
Net loss per share:
Basic and diluted	$ (0.03)	$ (0.39)	$ (0.20)	$ (0.69)
Shares used in per share calculation:
Basic and diluted	85,304	80,590	84,616	80,203
Product
Total net revenue	$ 60,599	$ 50,190	$ 115,973	$ 100,594
Total cost of revenue	31,251	32,005	57,860	58,107
Service [Member]
Total net revenue	38,561	32,125	73,314	64,664
Total cost of revenue	$ 16,306	$ 16,495	$ 32,641	$ 32,928