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Financial Risk Management Objectives - Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payment Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest-bearing loans and borrowings $ 41,461 $ 28,454
Trade and other payables 28,850 30,023
Other current financial liabilities - at fair value through profit or loss 139  
Finance lease liability 83 89
Financial liabilities 77,875 63,199
Within one year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Interest-bearing loans and borrowings 41,461 28,454
Trade and other payables 28,850 30,023
Other current financial liabilities - at fair value through profit or loss 139  
Finance lease liability 39 32
Financial liabilities 77,831 63,142
2 to 3 years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Finance lease liability 27 49
Financial liabilities 27 49
4 to 5 years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Finance lease liability 15 8
Financial liabilities 15 8
More than five years [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Finance lease liability 2  
Financial liabilities 2  
All other related parties [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Due to related parties 5,805 3,096
All other related parties [Member] | Within one year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Due to related parties 5,805 3,096
Immediate Holding Company [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Due to related parties 1,537 1,537
Immediate Holding Company [Member] | Within one year [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Due to related parties $ 1,537 $ 1,537