Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (54,452)	$ (51,893)	$ (138,255)	$ (199,876)
Cash flow hedges:
Change in unrealized loss on cash flow hedges, net of $0 tax benefit	0	(66)	0	(66)
Net change, net of tax	0	(66)	0	(66)
Available-for-sale investments:
Change in unrealized gain (loss) on investments	(172)	35	(10)	364
Net change, net of tax	(172)	35	(10)	364
Comprehensive loss	$ (54,624)	$ (51,924)	$ (138,265)	$ (199,578)