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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deferred tax assets    
Net operating loss carryforward $ 3,213 $ 2,416
Capital loss carryover 1,173 739
GAAP/Tax basis differences 4,073 3,903
Total deferred tax assets 8,459 7,058
Deferred tax liabilities    
Deferred tax liabilities 5 6
Valuation allowance (7,403) (6,069)
Total net deferred tax asset $ 1,051 $ 983