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Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax assets (liabilities)
Operating losses carried forward	$ 24,576	$ 21,318
Tax credits	882	679
Stock compensation	1,616	1,496
Other	1,099	1,293
Valuation allowance	$ (28,173)	$ (24,786)

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

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