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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Jan. 02, 2021
Dec. 28, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 2,236 $ 2,043
Work in process 548 1,111
Finished goods 2,930 5,020
Total inventories $ 5,714 $ 8,174