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Property and Equipment - Component of Property and Equipment (Details) - USD ($)
$ in Thousands
Jan. 02, 2021
Dec. 28, 2019
Component of property and equipment    
Less: accumulated depreciation and amortization $ (12,775) $ (12,354)
Property and equipment, net 449 730
Equipment    
Component of property and equipment    
Property and equipment, gross 10,760 10,594
Leasehold Improvements    
Component of property and equipment    
Property and equipment, gross $ 2,464 $ 2,490