Segment Information (Schedule Of Long-Lived Asset By Geographic Areas) (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 19,348	$ 19,473
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	8,950	9,542
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	2,440	2,745
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	192	210
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	6,199	5,219
APAC Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 1,567	$ 1,757