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Intangible assets - Components of intangible assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Intangible assets    
Gross Carrying Amount $ 1,209 $ 1,209
Accumulated Amortization and Impairments (1,034) (948)
Net Carrying Amount $ 175 261
Exclusive license agreement    
Intangible assets    
Intangible assets, useful life 4 years 2 months 12 days  
Gross Carrying Amount $ 231 231
Accumulated Amortization and Impairments (148) (142)
Net Carrying Amount $ 83 89
Software    
Intangible assets    
Intangible assets, useful life 7 months 6 days  
Gross Carrying Amount $ 978 978
Accumulated Amortization and Impairments (886) (806)
Net Carrying Amount $ 92 $ 172