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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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