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Property and equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property and equipment    
Opening net book value $ 899 $ 788
Additions 733 800
Foreign exchange 4 (17)
Depreciation (727) (672)
Closing net book value 909 899
Cost 3,125 2,377
Accumulated depreciation (2,216) (1,478)
Net book value 909 899
Leasehold improvements    
Property and equipment    
Opening net book value 212 286
Foreign exchange 3 (15)
Depreciation (57) (59)
Closing net book value 158 212
Cost 542 542
Accumulated depreciation (384) (330)
Net book value 158 212
Equipment under lease    
Property and equipment    
Opening net book value 687 502
Additions 733 800
Foreign exchange 1 (2)
Depreciation (670) (613)
Closing net book value 751 687
Cost 2,583 1,835
Accumulated depreciation (1,832) (1,148)
Net book value $ 751 $ 687