Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 12,855	$ 13,755	$ 26,561	$ 27,142
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	6,742	6,849	13,516	13,391
Europe, Middle East and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,843	2,821	7,020	6,252
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,482	3,185	4,625	6,039
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 788	$ 900	$ 1,400	$ 1,460