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Property and Equipment - Component of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Component of property and equipment    
Less: accumulated depreciation and amortization $ (12,354) $ (11,798)
Property and equipment, net 730 1,220
Equipment    
Component of property and equipment    
Property and equipment, gross 10,594 10,502
Leasehold Improvements    
Component of property and equipment    
Property and equipment, gross $ 2,490 $ 2,516