Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Non-cancellable Operating Leases, Reconciliation of Undiscounted Cash Flows to the Operating Lease Liability (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Operating Lease Liabilities, Payments Due [Abstract]
2022 (Excluding the nine months ended September 30, 2022)	$ 494
2023	1,992
Total future minimum lease payments, undiscounted	2,486
Less imputed interest	(113)
Operating lease liabilities	2,373
Operating lease liabilities reported as of September 30, 2022:
Operating lease liabilities - current	1,876	$ 1,755
Operating lease liabilities - non-current	497	$ 1,918
Total	$ 2,373