Segment and Related Information - Property, Plant and Equipment, Net by Geographic Location (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 9,771	$ 11,895
United States
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	8,115	9,701
Latin America
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	194	700
Europe
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	432	473
Middle East
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	831	803
Africa
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	140	139
Asia/Pacific
Property, Plant and Equipment, Net by Geographic Location:
Property, plant and equipment, net	$ 59	$ 79