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Income Taxes - Difference Between Customary Rate and Effective Tax Rate on Income Before Income Taxes Due (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Tax at statutory rate	21.00%	21.00%	21.00%
Tax effect of:
Research and development and other income tax credits	11.40%	0.00%	0.00%
Valuation allowance on deferred tax assets	4.50%	(0.90%)	(3.40%)
State income taxes, net of federal benefit	5.50%	(4.30%)	1.10%
Effect of changes in state tax laws or rates	(1.90%)	0.00%	0.00%
Other	0.00%	(1.60%)	(0.10%)
Effective tax rate	40.50%	14.20%	18.60%

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Effective income tax rate reconciliation research and development and other income tax credits.

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

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

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage 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 changes in the income tax rates.

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