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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deferred tax assets    
Net operating loss carryforward $ 1,351 $ 295
Net capital loss carryforward 0 0
GAAP/Tax basis differences 2,284 2,237
Total deferred tax assets 3,635 2,532
Deferred tax liabilities    
Deferred tax liabilities 148 144
Valuation allowance (3,201) (2,182)
Total net deferred tax asset $ 286 $ 206