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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred tax assets    
Net operating loss carryforward $ 2,708 $ 2,416
Capital loss carryover 739 739
GAAP/Tax basis differences 4,174 3,903
Total deferred tax assets 7,621 7,058
Deferred tax liabilities    
Deferred tax liabilities 5 6
Valuation allowance (6,410) (6,069)
Total net deferred tax asset $ 1,206 $ 983