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Summary of Significant Accounting Policies - Movement of Provision For Onerous Operating Contracts (Detail) - Onerous Contracts Provision [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure Of Other Provisions [Line Items]  
Beginning of financial year $ 250
Recognized 522
Reversed (246)
Exchange differences 29
End of financial year $ 555