Commitments and Contingencies - Information Related to Right-of-use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating lease costs	$ 278	$ 456
Short-term lease costs	7	1
Variable lease costs	167	225
Total lease costs	452	682
Operating cash used for operating leases	$ 317	508
Right-of-use assets obtained in exchange for operating lease liabilities		$ 479
Weighted-average remaining lease term (years)	3 years 5 months 4 days	4 years 5 months 1 day
Weighted-average discount rate	13.38%	13.48%