Segment Information - Long-Lived Assets by Geographic Region - Right-of-use Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating lease right-of-use asset	$ 4,118	$ 4,300
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating lease right-of-use asset	1,985	2,078
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating lease right-of-use asset	171	185
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating lease right-of-use asset	$ 1,962	$ 2,037