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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred income tax assets:    
Net operating loss $ 3,361 $ 1,519
Research and development credits 1,363 161
Stock compensation 175 580
Deferred compensation 705 389
Other 398 160
Total deferred income tax assets 6,002 2,809
Deferred income tax liabilities:    
Property and equipment (47,626) (33,761)
Goodwill and other intangible assets (266) (291)
Total deferred income tax liabilities (47,892) (34,052)
Net deferred income tax liabilities $ (41,890) $ (31,243)