CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,530	$ (5,381)	$ (6,603)	$ (42,736)
Other comprehensive income (loss) before tax:
Change in foreign currency translation adjustments	(2,372)	3,518	(5,302)	3,238
Other comprehensive income (loss) before tax	(2,372)	3,518	(5,302)	3,238
Provision for (benefit from) income taxes	128	(255)	339	(224)
Other comprehensive income (loss), net of tax	(2,500)	3,773	(5,641)	3,462
Total comprehensive loss	$ (970)	$ (1,608)	$ (12,244)	$ (39,274)