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Earnings Per Share Attributable To Ordinary Equity Holders of The Parent - Additional information (Detail)
12 Months Ended
Dec. 31, 2020
HKD ($)
Earnings per share [line items]  
Increase Decrease Through The Adjustment Effect Of Interest On The Convertible Bond $ 7,717,348
Increase (decrease) in credit derivative, fair value 7,765,148
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities $ 528,958