Segment Information - Long-Lived Assets by Geographic Region - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 8,113	$ 7,085
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,248	3,879
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	4,093	2,968
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 772	$ 238