Segment Information and Operations By Geographic Area (Schedule Of Long-Lived Asset By Geographic Areas) (Details) - USD ($) $ in Thousands	Oct. 02, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 19,476	$ 22,384
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	8,992	9,832
CANADA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,131	3,586
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	602	468
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	4,725	6,562
APAC Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,026	$ 1,936