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Inventories, Net - Schedule of Inventory, Current (Details) - USD ($)
$ in Thousands
Dec. 28, 2018
Dec. 29, 2017
Inventory Disclosure [Abstract]    
Raw materials and purchased parts $ 2,678 $ 2,506
Work in process 2,195 1,996
Finished goods 13,214 11,169
Total inventories, gross 18,087 15,671
Less inventory reserves 1,383 2,361
Total inventories, net $ 16,704 $ 13,310