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Fair Value and Fair Value Hierarchy of Financial Instruments - Disclosure of Fair Value Measurement of Liabilities Explanatory (Detail) - Liability measured at fair value [Member]
Dec. 31, 2021
HKD ($)
Disclosure of fair value measurement of liabilities [line items]  
Derivative financial instrument $ 13,752,673
Level 1 [member]  
Disclosure of fair value measurement of liabilities [line items]  
Derivative financial instrument 0
Level 2 [member]  
Disclosure of fair value measurement of liabilities [line items]  
Derivative financial instrument 0
Level 3 [member]  
Disclosure of fair value measurement of liabilities [line items]  
Derivative financial instrument $ 13,752,673