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Cash Flow Information - Summary of Reconciliation of Liabilities Arising from Financing Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Balance at January 1 $ 41,229 $ 28,308
Cash inflows/(outflows) (16,266) 10,367
Foreign exchange adjustments (125) 2,524
Acquisition of PP&E by means of a lease 61 30
Other changes 5  
Balance at December 31 24,904 41,229
Interest -bearing loans and borrowings [Member]    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Balance at January 1 41,151 28,225
Cash inflows/(outflows) (16,220) 10,408
Foreign exchange adjustments (117) 2,518
Acquisition of PP&E by means of a lease
Other changes  
Balance at December 31 24,814 41,151
Financial lease liabilities [Member]    
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]    
Balance at January 1 78 83
Cash inflows/(outflows) (46) (41)
Foreign exchange adjustments (8) 6
Acquisition of PP&E by means of a lease 61 30
Other changes 5  
Balance at December 31 $ 90 $ 78