Segment Information - Long-Lived Assets by Geographic Region - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 7,798	$ 8,113
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,191	3,248
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,831	4,093
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 776	$ 772