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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 2,675 $ 4,147
Work in process 1,075 1,278
Finished goods 5,044 3,956
Total inventories $ 8,794 $ 9,381