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Taxation - Deferred Tax Asset and Liability Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent [1] $ 6,072 $ 3,272
Within one year    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 6,033  
After one year    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 39  
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows