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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)