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Property and equipment - Summary of Property and equipment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January $ 457,802    
Charge for the year 188,003 $ 256,666 $ 356,288
As of 31 December 281,312 457,802  
Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January 1,229,681 1,816,893  
Additions 10,492    
Disposals (80,638)    
Foreign currency adjustments 11,000 (587,212)  
As of 31 December 1,170,535 1,229,681 1,816,893
Accumulated depreciation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January (771,879) (1,065,200)  
Disposals 80,638    
Charge for the year 188,003 256,666  
Foreign currency adjustments 9,979 549,987  
As of 31 December (889,223) (771,879) (1,065,200)
Leasehold improvements      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January 420,601    
As of 31 December 276,578 420,601  
Leasehold improvements | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January 776,261 837,844  
Additions 6,978    
Disposals (24,488)    
Foreign currency adjustments 4,726 (61,583)  
As of 31 December 763,477 776,261 837,844
Leasehold improvements | Accumulated depreciation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January (355,660) (246,518)  
Disposals 24,488    
Charge for the year 151,965 154,504  
Foreign currency adjustments 3,762 45,362  
As of 31 December (486,899) (355,660) (246,518)
Furniture, fittings and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January 37,201    
As of 31 December 4,734 37,201  
Furniture, fittings and equipment | Cost      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January 453,420 979,049  
Additions 3,514    
Disposals (56,150)    
Foreign currency adjustments 6,274 (525,629)  
As of 31 December 407,058 453,420 979,049
Furniture, fittings and equipment | Accumulated depreciation and impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
As of 1 January (416,219) (818,682)  
Disposals 56,150    
Charge for the year 36,038 102,162  
Foreign currency adjustments 6,217 504,625  
As of 31 December $ (402,324) $ (416,219) $ (818,682)