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Property and Equipment, Net (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Jan. 01, 2021
Dec. 27, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 44,378 $ 42,377
Less accumulated depreciation (26,220) (22,461)
Property, Plant and Equipment, Net, Total 18,158 19,916
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9,234 9,211
Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 33,591 31,631
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 997 980
Furniture And Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 556 $ 555