Property and Equipment - Net Property and Equipment at Cost (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment
Total property and equipment, at cost	$ 819	$ 819
Less: Accumulated depreciation and amortization	808	797
Property and equipment, net	11	22	[1]
Leasehold improvements
Property, Plant and Equipment
Total property and equipment, at cost	107	107
Equipment and other
Property, Plant and Equipment
Total property and equipment, at cost	$ 712	$ 712

[1] The condensed consolidated balance sheet at December 31, 2021 has been derived from the audited financial statements at that date.