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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Deferred tax assets (liabilities), Employee benefits and deferred compensation $ 1,076 $ 1,040
Deferred tax assets (liabilities), Investments and asset impairments 1,818 1,818
Deferred tax assets (liabilities), Other temporary differences (1,002) (871)
Deferred tax assets (liabilities), Net operating loss and capital loss carryforwards 15,739 15,591
Deferred tax assets, gross 17,631 17,578
Valuation allowance (17,631) (17,578)
Net deferred tax assets