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Segment reporting (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Operating Segments [Line Items]    
Total non-current assets other than financial instruments and deferred tax assets $ 50,289 $ 41,359
Switzerland    
Disclosure Of Operating Segments [Line Items]    
Total non-current assets other than financial instruments and deferred tax assets 46,370 39,052
France    
Disclosure Of Operating Segments [Line Items]    
Total non-current assets other than financial instruments and deferred tax assets 3,000 498
United States    
Disclosure Of Operating Segments [Line Items]    
Total non-current assets other than financial instruments and deferred tax assets 913 1,803
Brazil    
Disclosure Of Operating Segments [Line Items]    
Total non-current assets other than financial instruments and deferred tax assets $ 6 $ 6