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Related parties - Director and shareholder compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Board fees $ 320 $ 227  
Consultancy fees   20 $ 55
Total director and shareholder compensation 320 247 55
Bottom of range      
Disclosure of transactions between related parties [line items]      
Related party expenses $ 100 $ 100 $ 100