Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 271,890	$ 247,865
Cost of revenue	182,437	133,742
Gross profit	89,453	114,123
Operating expenses:
Research and development	77,039	89,336
Sales and marketing	68,616	72,052
General and administrative	26,692	36,088
Total operating expenses	172,347	197,476
Operating loss	(82,894)	(83,353)
Interest income, net	3,466	1,350
Other income, net	1,273	517
Loss before income taxes	(78,155)	(81,486)
Income tax expense (benefit)	1,310	(609)
Net loss	$ (79,465)	$ (80,877)
Net loss per share:
Basic (in dollars per share)	$ (0.31)	$ (0.34)
Diluted (in dollars per share)	$ (0.31)	$ (0.34)
Shares used to compute net loss per share:
Basic (in shares)	253,124	239,431
Diluted (in shares)	253,124	239,431