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Intangible assets - Rollforward of Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Disclosure of detailed information about intangible assets [line items]    
Beginning balance $ 14,360  
Ending balance 12,358 $ 14,598
Impairment of intangible assets 1,868 0
Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 15,964 14,844
Additions 19 1,115
Disposals (53)  
Exchange differences 2 (17)
Ending balance 15,932 15,942
Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,604) (1,262)
Disposals 53  
Exchange differences   6
Amortisation, intangible assets other than goodwill (155) (88)
Ending balance (3,574) (1,344)
Impairment of intangible assets (1,868)  
Licenses    
Disclosure of detailed information about intangible assets [line items]    
Ending balance 10,517 12,611
Licenses | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 13,680 12,985
Additions 0 695
Disposals 0  
Exchange differences 0 0
Ending balance 13,680 13,680
Licenses | Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,295) (1,069)
Disposals 0  
Exchange differences   0
Amortisation, intangible assets other than goodwill 0 0
Ending balance (3,163) (1,069)
Impairment of intangible assets (1,868)  
Internal development costs    
Disclosure of detailed information about intangible assets [line items]    
Ending balance 0 954
Internal development costs | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 0 631
Additions 0 323
Disposals 0  
Exchange differences 0 0
Ending balance 0 954
Internal development costs | Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 0 0
Disposals 0  
Exchange differences  
Amortisation, intangible assets other than goodwill 0 0
Ending balance 0 0
Impairment of intangible assets 0  
Internal development costs    
Disclosure of detailed information about intangible assets [line items]    
Ending balance 896 0
Internal development costs | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 954 0
Additions 0 0
Disposals 0  
Exchange differences 0 0
Ending balance 954 0
Internal development costs | Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 0 0
Disposals 0  
Exchange differences   0
Amortisation, intangible assets other than goodwill (58) 0
Ending balance (58) 0
Impairment of intangible assets 0  
Licenses    
Disclosure of detailed information about intangible assets [line items]    
Ending balance 870 946
Licenses | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,052 1,052
Additions 0 0
Disposals 0  
Exchange differences 0 0
Ending balance 1,052 1,052
Licenses | Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (125) (50)
Disposals 0  
Exchange differences   0
Amortisation, intangible assets other than goodwill (57) (56)
Ending balance (182) (106)
Impairment of intangible assets 0  
Software    
Disclosure of detailed information about intangible assets [line items]    
Ending balance 75 87
Software | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 278 176
Additions 19 97
Disposals (53)  
Exchange differences 2 (17)
Ending balance 246 256
Software | Accumulated amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (184) (143)
Disposals 53  
Exchange differences   6
Amortisation, intangible assets other than goodwill (40) (32)
Ending balance (171) $ (169)
Impairment of intangible assets $ 0