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Commitments - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Lease period description The Company leases office facilities under operating leases and recognizes lease expense on a straight-line basis over the lease term. Leases assets and liabilities are initially recorded at commencement date based on the present value of lease payments over the lease term  
Rent expense for office space $ 653,000 $ 663,000
Lease Payments Due Next year 599,000  
Lease payments due next two years 601,000  
Lessee, Operating Lease, Liability, to be Paid, Year Three $ 150,000  
Weighted-average discount rate 5.50%  
Operating lease weighted-average remaining lease term 15 months  
Operating Lease Payments $ 599,000  
Operating Lease, Cost $ 577,000