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Taxation - Summary of Net Operating Loss Carryforwards (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards $ 10,314 [1]
2018 [Member]  
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards 5,721
2019 [Member]  
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards 3,389
2020 [Member]  
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards 555
2021 [Member]  
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards 75
2022 and thereafter [Member]  
Net operating tax loss carryforwards [Line Items]  
Net operating tax loss carryforwards $ 574
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows