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Lease Arrangements - Supplemental Disclosures of Cash Flow Information Related to Leases (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Cash paid for operating leases $ 533 $ 510
Right-of-use assets obtained in exchange for operating lease liabilities   $ 1,056