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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 30, 2016
Inventory [Line Items]    
Raw materials and purchased parts $ 2,210 $ 2,264
Work-in-process 2,139 1,924
Finished goods 11,611 14,268
Inventory, Gross 15,960 18,456
Less: inventory reserves 2,502 3,631
Inventory, Net $ 13,458 $ 14,825