Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 9,256	$ 7,146
US
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	5,406	2,878
Korea
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	2,172	2,472
Japan
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	844	952
Canada
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	400
Germany
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	337	761
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 97	$ 83