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Property, Plant and Equipment - Right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of initial application of standards or interpretations [line items]      
Lease liabilities $ 10,454 $ 4,220  
IFRS 16      
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use assets     $ 5,899
Lease liabilities     $ 5,899
Addition to right-of use assets 8,474 246  
Depreciation expense of right-of use assets 2,619 2,018  
IFRS 16 | Offices and Buildings [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use assets $ 10,020 $ 4,115