Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Federal income tax at statutory rates, Amount	$ (859)
State income tax, net of federal tax benefit, Amount	196
Research and development credits, Amount	0
Research and development true-up, Amount	1,254
Stock-based compensation, Amount	18
Federal/state rate change, Amount	(914)
Change in valuation allowance, Amount	305
Effective tax rate, Amount	$ 0
Federal income tax at statutory rates	21.00%	21.00%
State income tax, net of federal tax benefit	(5.00%)	(2.00%)
Research and development credits	0.00%	0.00%
Research and development true-up	(31.00%)	29.00%
Stock-based compensation	0.00%	0.00%
Federal/state rate change	22.00%	0.00%
Change in valuation allowance	(7.00%)	(48.00%)
Effective tax rate	0.00%	0.00%