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Convertible Bond and Derivative Financial Liability - Summary of convertible bonds (Detail) - HKD ($) | 12 Months Ended
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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

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