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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets    
Net operating loss carryforward $ 295 $ 2,287
Net capital loss carryforward 0 1,123
GAAP/Tax basis differences 2,237 3,059
Total deferred tax assets 2,532 6,469
Deferred tax liabilities    
Deferred tax liabilities 144 303
Valuation allowance (2,182) (5,978)
Total net deferred tax asset $ 206 $ 188