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Inventories (Details) - USD ($)
$ in Thousands
Oct. 02, 2015
Jan. 02, 2015
Public Utilities, Inventory [Line Items]    
Raw materials and purchased parts $ 2,539 $ 2,146
Work-in-process 1,879 1,781
Finished goods 13,666 14,504
Inventory, Gross 18,084 18,431
Less: inventory reserves 3,462 2,714
Inventory, Net $ 14,622 $ 15,717