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Short-term deposits and cash and cash equivalents - Schedule of cash and cash equivalents (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash and cash equivalents [abstract]        
Bank balances $ 146,656,326 $ 35,288,761    
Cash on hand 3,869 191    
Cash and cash equivalents $ 146,660,195 $ 35,288,952 $ 14,489,880 $ 11,521,505