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Taxation - Schedule of Movement of Valuation Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxation      
Beginning balance $ (34,257) $ (20,181) $ (16,599)
Additions (4,704) (13,180) (6,720)
Exchange difference (1,963) (896) 3,138
Ending balance $ (40,924) $ (34,257) $ (20,181)