Inventories (Details) - USD ($) $ in Thousands	Jul. 03, 2015	Jan. 02, 2015
Public Utilities, Inventory [Line Items]
Raw materials and purchased parts	$ 2,287	$ 2,146
Work-in-process	1,857	1,781
Finished goods	12,872	14,504
Inventory, Gross	17,016	18,431
Less: inventory reserves	2,863	2,714
Inventory, Net	$ 14,153	$ 15,717