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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss | $ 5,355 | $ 3,361
Research and development credits | 1,363 | 1,363
Stock compensation | 114 | 175
Deferred compensation | 632 | 705
Other | 515 | 398
Total deferred income tax assets | 7,979 | 6,002
Deferred income tax liabilities: |  |
Property and equipment | (47,044) | (47,626)
Goodwill and other intangible assets | (223) | (266)
Total deferred income tax liabilities | (47,267) | (47,892)
Net deferred income tax liabilities | $ (39,288) | $ (41,890)

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