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Current and deferred tax - Summary of Income Tax expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Expense [Line Items]      
Current tax on profits for the year $ (1,646) $ (4,904) $ (1,015)
Increase in deferred tax 11,118 616 132
Total income tax $ 9,472 $ (4,288) $ (883)