Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Income Statement [Abstract]
Net revenue	$ 249,082	$ 245,201
Cost of revenue	167,074	168,882
Gross profit	82,008	76,319
Operating expenses:
Research and development	18,832	21,191
Sales and marketing	35,855	37,874
General and administrative	13,117	15,761
Separation expense	264	0
Restructuring and other charges	(68)	(9)
Total operating expenses	68,000	74,817
Income from operations	14,008	1,502
Interest income	701	748
Other income (expense), net	341	(1,318)
Income before income taxes	15,050	932
Provision (benefit) for income taxes	2,207	(86)
Net income from continuing operations	12,843	1,018
Net income from discontinued operations, net of tax	0	4,572
Net income	$ 12,843	$ 5,590
Net income per share - basic:
Income per share - basic, continuing operations (in dollars per share)	$ 0.41	$ 0.03
Income per share - basic, discontinued operations (in dollars per share)	0.00	0.15
Net income per share - basic (in dollars per share)	0.41	0.18
Net income per share - diluted:
Income per share - diluted, continuing operations (in dollars per share)	0.39	0.03
Income per share - diluted, discontinued operations (in dollars per share)	0.00	0.14
Net income per share - diluted (in dollars per share)	$ 0.39	$ 0.17
Weighted average shares used to compute net income per share:
Basic (in shares)	31,483	31,427
Diluted (in shares)	32,874	32,660