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Taxation - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Net [Abstract]    
Within one year   $ 133
After one year   985
Total deferred tax assets, net [1]   1,118
Deferred Tax Liabilities, Net [Abstract]    
Within one year $ (176) (165)
After one year (909) (1,014)
Total deferred tax liabilities $ (1,085) $ (1,179)
[1] As of December 31, 2019 and 2020, the deferred tax assets and liabilities balances are expected to be recoverable as follows: