Segment Information (Schedule of Long-Lived Asset by Geographic Areas) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 20,645	$ 20,177
United States (U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	5,757	4,993
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	3,882	4,359
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	148	95
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	7,748	7,652
APAC (excluding China)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 3,110	$ 3,078