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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 3,229 $ 4,147
Work in process 824 1,567
Finished goods 4,672 3,667
Total inventories $ 8,725 $ 9,381 [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 30, 2017.