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	Dec. 31, 2021	Dec. 31, 2020
Operating Lease Liabilities, Payments Due [Abstract]
2022	$ 1,957
2023	1,991
Total future minimum lease payments, undiscounted	3,948
Less imputed interest	(275)
Operating lease liabilities	3,673
Operating lease liabilities reported as of December 31, 2021:
Operating lease liabilities - current	1,755	$ 1,602
Operating lease liabilities - non-current	1,918	$ 3,673
Total	$ 3,673