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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)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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