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Lease liabilities and right-of-use assets - Sublease receivables (Details)
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 01, 2022
ft²
Lease liabilities and right-of-use assets      
Balance as of 1 January $ 571,022    
Interest income 12,349    
Lease rentals received (583,371)    
Balance as of 31 December   $ 571,022  
Sub Lease, Interest Income $ 12,349 $ 37,706  
Area Of Land Subleased | ft²     10,417