Business Segments - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 13,387	$ 11,959
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	6,819	5,564
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	3,273	2,417
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,735	3,174
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 560	$ 804