Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 20,294	$ (79,465)
Other comprehensive income (loss):
Change in unrealized gain on investments	45	162
Net change, net of tax	45	162
Comprehensive income (loss)	$ 20,339	$ (79,303)