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Convertible notes (Details) - USD ($)
12 Months Ended
Apr. 30, 2020
Apr. 18, 2018
Dec. 31, 2023
Jan. 31, 2020
Convertible notes        
Purchased note   $ 5,779,602,000    
Interest rate   2.50%   8.00%
Debt Instrument, term   5 years    
Optional Conversion Amount   3,853,068    
Conversion price   $ 1.50    
2018 Notes        
Convertible notes        
Conversion price     $ 1.38  
Present value of the expected dividend     $ 500,000  
Fair value of the liability component is attributable to equity component     $ 5,300,000  
Debt instrument issue price     $ 1.07  
Century Skyway Limited | 2019 Notes        
Convertible notes        
Principal amount $ 160,000      
Fair value of the liability component is attributable to equity component 3,600,000      
Principal amount to be surrendered in the disposal $ 3,760,000      
Number of shares to sell 5,100