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Convertible securities - Movements of Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Convertible securities      
At January 1, 2021 $ 0 $ 15,346,113  
Proceeds from issuance of convertible securities   4,980,718 $ 12,499,363
Changes in fair value recognized in profit or loss 0 29,054,669 2,846,750
Changes in fair value recognized in other reserve due to amendment of terms   811,819  
Converted to Series D preference shares of PHCL (note 25)   (50,193,319)  
At December 31, 2021, January 1, 2022 and December 31, 2022 $ 0 $ 0 $ 15,346,113