CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Income Statement [Abstract]
Product	$ 70,285	$ 57,245	$ 205,342	$ 215,165
Services	31,121	26,060	87,467	75,259
Total net revenue	101,406	83,305	292,809	290,424
Product	34,460	23,584	105,698	95,021
Services	15,583	13,490	44,054	39,759
Total cost of revenue	50,043	37,074	149,752	134,780
Total gross profit	51,363	46,231	143,057	155,644
Operating expenses:
Research and development	24,202	21,679	74,272	65,824
Selling, general and administrative	36,112	28,966	105,498	91,443
Amortization of intangibles	3,009	1,446	9,606	4,338
Restructuring and related charges	(27)	397	4,488	626
Total operating expenses	63,296	52,488	193,864	162,231
Loss from operations	(11,933)	(6,257)	(50,807)	(6,587)
Interest (expense) income, net	(2,734)	30	(7,806)	102
Other income (expense), net	(328)	148	(5)	(299)
Loss on impairment of long-term investment	(1,259)	0	(2,735)	(2,505)
Loss before income taxes	(16,254)	(6,079)	(61,353)	(9,289)
Provision for (benefit from) income taxes	(242)	(1,268)	518	(827)
Net loss	$ (16,012)	$ (4,811)	$ (61,871)	$ (8,462)
Net loss per share:
Basic and diluted	$ (0.21)	$ (0.05)	$ (0.80)	$ (0.10)
Shares used in per share calculation:
Basic and diluted	78,092	87,991	77,475	88,359