Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Right-of-use asset	$ 471,000		$ 471,000
Lease liability	471,000		471,000
Operating Lease Rent Expense	$ 19,000	$ 21,000	$ 57,000	$ 62,000
Operating weighted average remaining lease term	5 years 6 months		5 years 6 months
Operating weighted average discount rate	1.79%		1.79%