Leases - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Apr. 30, 2021 ft²	Jul. 31, 2019 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Lessee Lease Description [Line Items]
Operating Lease, Liability, Current			$ 155,000	$ 282,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]			Operating Lease, Liability, Current	Operating Lease, Liability, Current
Long-term lease liabilities			$ 0	$ 175,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]				Long-term lease liabilities
Finance lease, weighted-average remaining lease term			4 months 24 days	1 year 4 months 24 days
Finance lease, discount rate				9.00%
Operating lease, weighted-average remaining lease term			4 months 24 days	1 year 4 months 24 days
Operating lease, discount rate				9.00%
Redwood City, California [Member]
Lessee Lease Description [Line Items]
Area of operating lease | ft²	6,368	6,368
Operating lease, description			In July 2019, the Company executed a non-cancellable lease agreement for 6,368 square feet of new space in Redwood City, California, which began in September 2019 and expired in May 2021. In April 2021, the Company executed a non-cancellable operating lease agreement for the same 6,368 square feet of space, which began in June 2021 and expires in May 2023.
Operating lease beginning date	2021-06	2019-09
Operating lease, expiration	2023-05	2021-05
Payment to acquire office furniture under operating lease		$ 1