Income Taxes (Net Deferred Income Tax Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss carryforward	$ 3,892	$ 3,899
Valuation allowance	(3,892)	(3,899)
Total deferred tax assets	0	0
Deferred tax liabilities:
Built-in gain	0	0
Total deferred tax liabilities	0	0
Net deferred tax asset	$ 0	$ 0