Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 7,170	$ 6,769
United States
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	2,911	2,809
Korea
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	2,445	2,020
Japan and Vietnam
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	996	1,074
Taiwan and India
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	18	24
Germany
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 800	$ 842