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Revenue, Other Income And Other Gain - Schedule of transaction prices allocated to the remaining performance obligations (Detail) - HKD ($)
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Disclosure of performance obligations [line items]      
Current contract liabilities $ 17,077,186 $ 630,962 $ 47,270,998
Digital solutions and other services [Member]      
Disclosure of performance obligations [line items]      
Current contract liabilities 306,146,612    
Within one year | Digital solutions and other services [Member]      
Disclosure of performance obligations [line items]      
Transaction price allocated to remaining performance obligations 204,702,968    
More than one year | Digital solutions and other services [Member]      
Disclosure of performance obligations [line items]      
Transaction price allocated to remaining performance obligations $ 101,443,644