Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 11,581	$ 12,850	$ 35,973	$ 39,411
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	5,464	6,140	16,383	19,656
Europe, Middle East and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,802	4,197	9,167	11,217
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,708	2,136	8,750	6,761
Americas, excluding the U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 607	$ 377	$ 1,673	$ 1,777