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Trade and Other Receivables - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Trade And Other Receivables [Abstract]      
Fair values of collateral   $ 1,339  
Impairment loss   $ 30  
Fair values of collateral auctioned     $ 1,060
Net amount owed by customer     1,242
Allowance     $ 111
Additional loss due to sale of asset pledged as collateral $ 182