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Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 29, 2017
Dec. 30, 2016
Inventory [Line Items]    
Raw materials and purchased parts $ 2,506 $ 2,264
Work in process 1,996 1,924
Finished goods 11,169 14,268
Inventory, Gross 15,671 18,456
Less inventory reserves 2,361 3,631
Total $ 13,310 $ 14,825