Schedule Of Long-Lived Asset By Geographic Areas (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 20,660	$ 19,473	$ 22,384
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	9,216	9,542	9,832
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	1,807	2,745	3,586
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	141	210	468
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	6,803	5,219	6,562
APAC Excluding China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 2,693	$ 1,757	$ 1,936