Property, Plant and Equipment, net (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Depreciation expense	$ 102,000	$ 94,000
Building
Property Plant And Equipment [Line Items]
Estimated service life	25 years
Furniture, fixtures and office equipment [Member]
Property Plant And Equipment [Line Items]
Estimated service life	5 years
Software and technology assets [Member]
Property Plant And Equipment [Line Items]
Estimated service life	3 years