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Taxation - Schedule of Current and Deferred Portions of Income Tax Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Taxation      
Current income tax (benefits)/expenses $ 315 $ (471) $ (38)
Deferred income tax (benefits)/expenses 4,361 382 (2,214)
Income tax benefit $ 4,676 $ (89) $ (2,252)