Income Taxes - Narrative (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Income tax expense	$ 0	$ 0
Increase in valuation allowance	19,400,000	$ 14,400,000
Penalties related to income tax matters	0
Accrued interest related to income tax matters	0
Federal
Income Tax Disclosure [Line Items]
Operating loss carryforwards	187,200,000
Operating loss carryforwards, carried forward indefinitely	143,100,000
Federal | Research and Development
Income Tax Disclosure [Line Items]
Tax credit carryforwards	9,100,000
State
Income Tax Disclosure [Line Items]
Operating loss carryforwards	92,000,000
Operating loss carryforwards, carried forward indefinitely	22,300,000
State | Research and Development
Income Tax Disclosure [Line Items]
Tax credit carryforwards	$ 3,100,000