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Accounts Receivable - Summary of aging analysis of accounts receivable (Detail) - HKD ($)
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Aging Anaylsis Of Accounts Receivable [Line Items]    
Accounts receivable $ 187,673,616 $ 86,514,680
Current [member]    
Disclosure Of Aging Anaylsis Of Accounts Receivable [Line Items]    
Accounts receivable 177,754,160 74,048,058
Within 1 month [member]    
Disclosure Of Aging Anaylsis Of Accounts Receivable [Line Items]    
Accounts receivable 7,270,723 53,633
1 to 3 months [member]    
Disclosure Of Aging Anaylsis Of Accounts Receivable [Line Items]    
Accounts receivable 1,545,263 5,165,947
Over 3 months [member]    
Disclosure Of Aging Anaylsis Of Accounts Receivable [Line Items]    
Accounts receivable $ 1,103,470 $ 7,247,042