Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 12,631	$ 12,855	$ 24,392	$ 26,561
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	5,598	6,742	10,919	13,516
Europe, Middle East and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,667	2,843	6,365	7,020
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	3,597	2,482	6,042	4,625
Americas, excluding the U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 769	$ 788	$ 1,066	$ 1,400