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Convertible Bond and Derivative Financial Liability - Summary of convertible bonds (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Summary of movement of convertible bond [line items]      
Fair value gain recognized in profit or loss $ 13,347,266 $ 0 $ 7,765,148
Convertible bonds [member] | Liability component [Member]      
Summary of movement of convertible bond [line items]      
Beginning balance 111,970,384 103,278,429  
Interest for the year 430,702 8,085,419  
Exchange alignment   606,536  
Ending balance 0 111,970,384 103,278,429
Fair value gain recognized in profit or loss 0    
Converted into class A shares (112,401,086)    
Convertible bonds [member] | Derivative Financial Liability [Member]      
Summary of movement of convertible bond [line items]      
Interest for the year 0    
Beginning balance 13,752,673 12,954,313  
Fair value gain recognized in profit or loss (13,347,266)    
Exchange alignment   798,360  
Converted into class A shares (405,407)    
Ending balance $ 0 $ 13,752,673 $ 12,954,313