CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,878)	$ (2,818)	$ (8,769)	$ (10,673)
Other comprehensive income (loss), before tax:
Change in unrealized net gain (loss) on available-for-sale investments	53	(161)	222	(335)
Foreign currency translation losses	(229)	(219)	(219)	(252)
Other comprehensive income (loss), before tax	(176)	(380)	3	(587)
Income taxes related to items in other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	(176)	(380)	3	(587)
Comprehensive loss	$ (5,054)	$ (3,198)	$ (8,766)	$ (11,260)