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Reconciliation of Changes in Allowance for Loans Receivable Current (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]      
Balance at beginning of year $ 30 $ 29 $ 30
Translation adjustment 2 1 (1)
Balance at end of year $ 32 $ 30 $ 29