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Intangible assets - Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill $ 3,764 $ 5,687
Additions to intangible assets 1,543 246
Acquisition of intangible assets 17,279  
Amortization expense (1,798) (1,657)
Disposals   (512)
Intangible assets other than goodwill 20,788 3,764
Cost    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill 59,855 60,409
Additions to intangible assets 1,543 246
Acquisition of intangible assets 17,279  
Amortization expense 0 0
Disposals   (800)
Intangible assets other than goodwill 78,677 59,855
Accumulated depreciation    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill (56,091) (54,722)
Additions to intangible assets 0 0
Acquisition of intangible assets 0  
Amortization expense (1,798) (1,657)
Disposals   288
Intangible assets other than goodwill $ (57,889) $ (56,091)