Business Segments and Geographical Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 36,347	$ 43,447
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	19,312	22,270
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	8,006	9,894
Americas, excluding the U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	1,967	2,857
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 7,062	$ 8,426