Income Taxes - Income tax expense reconciled (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Income Taxes
Statutory rate	21.00%	21.00%
Federal income taxes (benefit) at statutory rates	$ (8,583)	$ (7,964)
State income taxes (benefit), net of Federal benefit	(2,561)	(2,901)
Stock compensation	(550)	610
Other permanent differences	299
Rate changes and other	1,067	(819)
Change in valuation allowance	9,228	12,294
Provision for income taxes
Capitalized R&D expenses	$ 19,670	$ 19,204

Amount of research and development costs capitalized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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