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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Allowance for credit losses and inventory reserves | $ 1,337 | $ 625
Warranty accrual | 4,184 | 3,675
Other accruals | 4,814 | 1,406
Share-based compensation | 7,440 | 7,568
Research & development expenses | 11,265 | 0
Oklahoma investment credit carryforward | 3,115 | 3,404
Other, net | 2,339 | 4,112
Gross deferred income tax assets | 34,494 | 20,790
Valuation allowance | (3,115) | (3,404)
Net deferred income tax assets | 31,379 | 17,386
Property & equipment | (50,040) | (49,379)
Total deferred income tax liabilities | (50,040) | (49,379)
Net deferred income tax liabilities | $ 18,661 | $ 31,993

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