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Cash Flow Information - Summary of Net Debt Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]        
Balance at January 1 $ 28,308      
Cash inflows 27,714      
Cash outflows (17,347)      
Foreign exchange adjustments 2,524      
Acquisition of PP&E by finance lease 30      
Balance at December 31 41,229      
Cash and cash equivalents 46,093 $ 48,231 $ 51,303 $ 68,863
Net credit 4,864      
Interest -bearing loans and borrowings [Member]        
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]        
Balance at January 1 28,225      
Cash inflows 27,714      
Cash outflows (17,306)      
Foreign exchange adjustments 2,518      
Balance at December 31 41,151      
Financial lease liabilities [Member]        
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items]        
Balance at January 1 83      
Cash outflows (41)      
Foreign exchange adjustments 6      
Acquisition of PP&E by finance lease 30      
Balance at December 31 $ 78