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Other income and other net gains/(losses) - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other income and other net gain/(losses)      
Revenue from funding support of employee support scheme $ 234,470   $ 470,165
Revenue from Funding Support of Jobs Support Scheme $ 300,208 $ 7,932 $ 43,695