Income Taxes - Summary of Significant Components of Deferred Tax Assets (Detail) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 25,012,000	$ 23,803,000
Research and development tax credits	2,842,000	2,842,000
Stock-based compensation	11,000	1,839,000
Capitalized research and development	168,000	161,000
Lease liability	37,000
Accruals and others	196,000	294,000
Total deferred tax assets	28,266,000	28,939,000
Less: Valuation allowance	(28,230,000)	$ (28,939,000)
Deferred tax liabilities:
Right-of-use assets	(36,000)
Total deferred tax liabilities	$ (36,000)