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Leases - Components of Operating Lease Cost and Other Related Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Leases [Abstract]        
Operating lease cost $ 12 $ 19 $ 23 $ 31
Total operating lease cost 12 19 23 31
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases $ 12 $ 19 $ 23 $ 31
Weighted average lease term remaining (in years) 3 years 11 months 8 days 4 years 9 months 18 days 3 years 11 months 8 days 4 years 9 months 18 days
Weighted average discount rate 3.31% 3.28% 3.31% 3.28%