Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 12,850	$ 14,635	$ 39,411	$ 41,777
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	6,140	7,415	19,656	20,806
Europe, Middle East and Africa
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	4,197	3,480	11,217	9,732
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,136	2,910	6,761	8,949
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 377	$ 830	$ 1,777	$ 2,290