Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 13,755	$ 13,426	$ 13,426	$ 27,142	$ 25,385
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	6,849	6,396		13,391	11,960
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,821	3,293		6,252	5,710
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	3,185	3,342		6,039	6,516
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 900	$ 395		$ 1,460	$ 1,199