Commitments and Contingencies - Additional Information (Detail)			1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 13, 2024 USD ($) ft²	Feb. 08, 2024 ft²	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Commitments And Contingencies [Line Items]
Operating lease, extension expiration				2025-05
Increase in right of use assets			$ 2,800,000		$ 600,000
Operating lease, short-term liability			$ 448,000	$ 448,000	$ 273,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]			Operating lease, short-term liability	Operating lease, short-term liability	Operating lease, short-term liability
Long-term operating lease liabilities			$ 2,581,000	$ 2,581,000	$ 130,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]			Long-term operating lease liabilities	Long-term operating lease liabilities	Long-term operating lease liabilities
Increase in lease liability			$ 2,800,000		$ 600,000
Operating lease, weighted average discount rate			8.50%	8.50%	8.25%
Operating lease remaining term			5 years	5 years	17 months
Non-cancelable other commitments			$ 2,800,000	$ 2,800,000
Redwood City, California [Member]
Commitments And Contingencies [Line Items]
Operating lease, description				began in June 2021 and expired in May 2023
Operating lease beginning date				2021-06
Operating lease, expiration				2023-05
Operating lease, term of contract	5 years	6 months	24 months	24 months
Operating lease, expiration date		Sep. 17, 2024
Area of operating lease | ft²	18,026	4,141
Rent payments	$ 57,400
Rent payments annual increase percentage	3.00%