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Intangible assets - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period $ 26,930  
Intangible assets at end of period 31,337 $ 26,930
Goodwill    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 14,482 20,020
Exchange differences 2,144 (1,687)
Additions 0 0
Disposal   0
Disposal of subsidiary   (3,851)
Amortization charge 0 0
Intangible assets at end of period 16,626 14,482
Goodwill | Cost    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 14,482 20,020
Intangible assets at end of period 16,626 14,482
Goodwill | Accumulated amortization    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 0 0
Intangible assets at end of period 0 0
Software    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 5,264 6,261
Exchange differences 595 (954)
Additions 1,823 823
Disposal   (46)
Disposal of subsidiary   0
Amortization charge (1,197) (820)
Intangible assets at end of period 6,485 5,264
Software | Cost    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 11,799 11,976
Intangible assets at end of period 14,217 11,799
Software | Accumulated amortization    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period (6,535) (5,715)
Intangible assets at end of period (7,732) (6,535)
Trademarks    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 7,150 7,316
Exchange differences 1,407 (80)
Additions 0 326
Disposal   0
Disposal of subsidiary   0
Amortization charge (366) (412)
Intangible assets at end of period 8,191 7,150
Trademarks | Cost    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 9,118 8,872
Intangible assets at end of period 10,525 9,118
Trademarks | Accumulated amortization    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period (1,968) (1,556)
Intangible assets at end of period (2,334) (1,968)
Others    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 34 82
Exchange differences (4) (35)
Additions 73 94
Disposal   (46)
Disposal of subsidiary   0
Amortization charge (68) (61)
Intangible assets at end of period 35 34
Others | Cost    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 441 428
Intangible assets at end of period 510 441
Others | Accumulated amortization    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period (407) (346)
Intangible assets at end of period (475) (407)
Intangible assets    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 26,930 33,679
Exchange differences 4,142 (2,756)
Additions 1,896 1,243
Disposal   (92)
Disposal of subsidiary   (3,851)
Amortization charge (1,631) (1,293)
Intangible assets at end of period 31,337 26,930
Intangible assets | Cost    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period 35,840 41,296
Intangible assets at end of period 41,878 35,840
Intangible assets | Accumulated amortization    
Activity of Intangible Assets [Roll Forward]    
Intangible assets at beginning of period (8,910) (7,617)
Intangible assets at end of period $ (10,541) $ (8,910)