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Intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items]    
Beginning balance $ 11,574 $ 13,425
Ending balance 66 11,574
Website and mobile apps    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 3 37
Ending balance 0 3
Trademark and technology    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 10,320 11,612
Ending balance 0 10,320
Computer software    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 611 1,056
Ending balance 66 611
Customer relationship    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 640 720
Ending balance 0 640
Cost:    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 37,440 37,542
Additions   59
Additions from acquisition   3
Disposals   (2)
Disposal of a subsidiary 34,949  
Written off   (162)
Exchange differences 11 0
Ending balance 2,502 37,440
Cost: | Website and mobile apps    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,079 1,073
Additions   0
Additions from acquisition   0
Disposals   0
Disposal of a subsidiary 0  
Written off   0
Exchange differences (2) 6
Ending balance 1,077 1,079
Cost: | Trademark and technology    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 34,088 34,087
Additions   0
Additions from acquisition   0
Disposals   0
Disposal of a subsidiary 33,935  
Written off   0
Exchange differences 0 1
Ending balance 153 34,088
Cost: | Computer software    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,473 1,582
Additions   59
Additions from acquisition   3
Disposals   (2)
Disposal of a subsidiary 214  
Written off   (162)
Exchange differences 13 (7)
Ending balance 1,272 1,473
Cost: | Customer relationship    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 800 800
Additions   0
Additions from acquisition   0
Disposals   0
Disposal of a subsidiary 800  
Written off   0
Exchange differences 0 0
Ending balance 0 800
Accumulated depreciation:    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (25,866) (24,117)
Disposals   2
Disposal of a subsidiary (24,517)  
Charge for the year 1,087 1,913
Written off   162
Exchange differences 0 0
Ending balance (2,436) (25,866)
Accumulated depreciation: | Website and mobile apps    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (1,076) (1,036)
Disposals   0
Disposal of a subsidiary 0  
Charge for the year 3 34
Written off   0
Exchange differences 2 (6)
Ending balance (1,077) (1,076)
Accumulated depreciation: | Trademark and technology    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (23,768) (22,475)
Disposals   0
Disposal of a subsidiary (24,210)  
Charge for the year 595 1,292
Written off   0
Exchange differences 0 (1)
Ending balance (153) (23,768)
Accumulated depreciation: | Computer software    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (862) (526)
Disposals   2
Disposal of a subsidiary (110)  
Charge for the year 452 507
Written off   162
Exchange differences (2) 7
Ending balance (1,206) (862)
Accumulated depreciation: | Customer relationship    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (160) (80)
Disposals   0
Disposal of a subsidiary (197)  
Charge for the year 37 80
Written off   0
Exchange differences 0 0
Ending balance $ 0 $ (160)