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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 28, 2019
Dec. 29, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 2,424 $ 2,675
Work in process 811 1,075
Finished goods 5,661 5,044
Total inventories $ 8,896 $ 8,794 [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 29, 2018.