Segment Information and Operations By Geographic Area (Schedule Of Long-Lived Asset By Geographic Areas) (Details) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 20,687	$ 22,384
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	9,193	9,832
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,169	3,586
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	367	468
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	5,851	6,562
APAC Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,107	$ 1,936