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Leases - Summary of Lease Liabilities are Included within Other Liabilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost $ 1,731 $ 1,523
Total lease cost $ 1,731 1,523
Cash paid for amounts included in the measurement of lease liabilities   $ 1,441