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Inventories (Details) - USD ($)
$ in Thousands
Mar. 30, 2018
Dec. 29, 2017
Inventory [Line Items]    
Raw materials and purchased parts $ 2,485 $ 2,506
Work in process 2,451 1,996
Finished goods 10,566 11,533
Inventory, Gross 15,502 16,035
Less inventory reserves 2,058 2,361
Total $ 13,444 $ 13,674