Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Income Statement [Abstract]
Net revenue	$ 366,820	$ 330,723	$ 711,793	$ 654,380
Cost of revenue	257,648	238,787	498,116	465,512
Gross profit	109,172	91,936	213,677	188,868
Operating expenses:
Research and development	31,371	23,357	60,318	46,040
Sales and marketing	46,983	36,461	90,641	74,690
General and administrative	20,448	12,950	37,086	26,144
Separation expense	11,984	0	18,768	0
Restructuring and other charges	1,376	22	1,367	59
Litigation reserves, net	5	53	5	53
Total operating expenses	112,167	72,843	208,185	146,986
Income (loss) from operations	(2,995)	19,093	5,492	41,882
Interest income	1,072	482	1,820	887
Other income (expense), net	1,061	383	(191)	718
Income (loss) before income taxes	(862)	19,958	7,121	43,487
Provision for income taxes	4,368	5,376	6,761	12,911
Net income (loss)	$ (5,230)	$ 14,582	$ 360	$ 30,576
Net income (loss) per share:
Basic (in dollars per share)	$ (0.17)	$ 0.45	$ 0.01	$ 0.94
Diluted (in dollars per share)	$ (0.17)	$ 0.44	$ 0.01	$ 0.91
Weighted average shares used to compute net income (loss) per share:
Basic (in shares)	31,674	32,352	31,550	32,650
Diluted (in shares)	31,674	33,116	32,722	33,656