Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Detail)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Federal income tax at statutory rates	21.00%	21.00%
State income tax, net of federal tax benefit	(2.00%)	(92.00%)
Research and development credits	0.00%	2.00%
Research and development true-up	29.00%	(1.00%)
Stock-based compensation	0.00%	0.00%
Federal/state rate change	0.00%	(3.00%)
Change in valuation allowance	(48.00%)	73.00%
Effective tax rate	0.00%	0.00%

Effective income tax rate reconciliation nondeductible expense federal rate change.

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Effective income tax rate reconciliation nondeductible expense research and development true up.

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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 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 nondeductible expense for share-based payment arrangement.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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