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Income Taxes - Deferred Tax Asset (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deferred tax assets    
Net operating loss carryforward $ 2,174 $ 2,287
Net capital loss carryforward 0 1,123
GAAP/Tax basis differences 3,556 3,059
Total deferred tax assets 5,730 6,469
Deferred tax liabilities    
Deferred tax liabilities 200 303
Valuation allowance (5,248) (5,978)
Total net deferred tax asset $ 282 $ 188