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Business Segments and Geographical Information - Revenue Information by Geographic Region (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Revenues From External Customers And Long Lived Assets [Line Items]    
Total revenues $ 43,447 $ 42,600
United States    
Revenues From External Customers And Long Lived Assets [Line Items]    
Total revenues 22,270 22,097
Europe    
Revenues From External Customers And Long Lived Assets [Line Items]    
Total revenues 9,894 9,742
Americas, excluding the U.S.    
Revenues From External Customers And Long Lived Assets [Line Items]    
Total revenues 2,857 2,590
Asia/Pacific Rim    
Revenues From External Customers And Long Lived Assets [Line Items]    
Total revenues $ 8,426 $ 8,171