Segment Information (Schedule of Long-Lived Asset by Geographic Areas) (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 19,779	$ 20,660
United States (U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	8,835	9,216
Americas (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	1,711	1,807
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	154	141
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	6,622	6,803
APAC (excluding China)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 2,457	$ 2,693