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Segment Information (Schedule Of Long-Lived Asset By Geographic Areas) (Details) - USD ($) $ in Thousands | Oct. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 20,228 | $ 19,473
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 9,278 | 9,542
Canada [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 1,832 | 2,745
EMEA [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 172 | 210
China [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | 6,390 | 5,219
APAC Excluding China [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-lived assets | $ 2,556 | $ 1,757

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