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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 2,043 $ 2,675
Work in process 1,111 1,075
Finished goods 5,020 5,044
Total inventories $ 8,174 $ 8,794