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Income Taxes - components of Long Term Deferred Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets: |  |
State net operating loss carryforwards | $ 96 | $ 291
Foreign net operating loss carryforwards | 182 | 276
Federal tax credit carryforwards | 1,999 |
State tax credit carryforwards | 9,560 | 8,683
Property, plant and equipment | 6,979 | 8,755
Operating lease liability | 5,564 | 1,564
Accrued compensation | 242 | 276
Inventories | 804 | 1,613
Stock compensation | 1,790 | 1,620
Warranty | 3,108 | 1,993
Deferred revenue | 6,389 | 4,501
Capitalized research and development costs | 38,036 | 18,067
Gross deferred tax assets | 74,749 | 47,639
Valuation allowance | (10,963) | (8,370)
Net deferred tax assets | 63,786 | 39,269
Deferred tax liabilities: |  |
Intangible assets |  | (176)
Right-of-use asset | (9,155) | (5,400)
Other | (1,203) | (1,992)
Gross deferred tax liabilities | (10,358) | (7,568)
Deferred taxes, net | $ 53,428 | $ 31,701

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