Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 7,880	$ 7,146
US
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	3,594	2,878
Korea
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	2,294	2,472
Japan
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	870	952
Canada
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	619
Germany
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	412	761
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 91	$ 83