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Taxation - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets, Net [Abstract]    
Within one year $ 133 $ 2,092
After one year 985 3,598
Total deferred tax assets, net [1] 1,118 5,690
Deferred Tax Liabilities, Net [Abstract]    
Within one year (165) (167)
After one year (1,014) (1,199)
Total deferred tax liabilities $ (1,179) $ (1,366)
[1] As at December 31, 2018 and 2019, the deferred tax assets and liabilities balances are expected to be recoverable as follows: