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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 2,411 $ 2,043
Work in process 601 1,111
Finished goods 3,992 5,020
Total inventories $ 7,004 $ 8,174 [1]
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2019.