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Equipment and leasehold improvements (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Main office space [Member]    
Disclosure of initial application of standards or interpretations [line items]    
Lease term 15 years  
Representative office [Member] | Minimum    
Disclosure of initial application of standards or interpretations [line items]    
Lease term 3 years  
Representative office [Member] | Maximum    
Disclosure of initial application of standards or interpretations [line items]    
Lease term 5 years  
IFRS 16 [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] | Buildings [member]    
Disclosure of initial application of standards or interpretations [line items]    
Balance at Beginning $ 12,522 $ 17,435
Additions 68 14
Depreciation of right-of-use assets (1,128) (1,440)
Effect of changes in exchange rates (34) 7
Reclassification to investment property 0 (3,494)
Decrease (205) 0
Balance at Ending $ 11,223 $ 12,522