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Share-based compensation - Stock warrants (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Jan. 31, 2022
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Share-based compensation          
Granted, Stock options     2,755,140 2,755,140  
Number of shares per warrant     1 1  
Exercise price     $ 11.50 $ 11.50  
Stock compensation expense       $ 4,400,000  
Stock warrants          
Share-based compensation          
Granted, Stock options   1,867,368      
Proceeds from issuance $ 150,000 $ 150,000      
Number of shares per warrant   1      
Exercise price   $ 4.05      
Warrants exercisable term   10 years      
Aggregate fair value of warrants   $ 1,376,800      
Stock compensation expense         $ 1,226,800
Number of warrants granted       0  
Number of outstanding warrants     746,947 746,947