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Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets (liabilities)    
Operating losses carried forward $ 16,028 $ 11,382
Tax credits 1,217 1,243
Stock compensation 1,447 1,414
Other 85 530
Valuation allowance $ (18,777) $ (14,569)