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Financial Instruments By Category - Summary of Financial Assets (Detail) - HKD ($) | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |
Accounts receivable | $ 187,673,616 | $ 86,514,680 |  |
Financial assets included in prepayments, deposits and other receivables | 954,518,603 | 1,196,110 |  |
Due from immediate holding company | 2,239,358,702 | 2,144,975,230 |  |
Financial assets at fair value through profit or loss | 1,523,195,334 | 2,786,027,085 |  |
Derivative financial assets | 1,443,134,162 | 969,894,519 |  |
Other assets | 9,620,468 | 136,065,738 |  |
Restricted cash | 3,239,362 | 0 |  |
Cash and bank balances | 1,078,411,335 | 526,206,108 | $ 453,966,764 | $ 766,430,471
Financial assets | 2,966,329,496 | 3,755,921,604 |  |
Financial Assets By Category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets | 7,439,151,582 | 6,650,879,470 |  |
Financial assets at fair value through profit or loss mandatorily measured at fair value category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Financial assets at fair value through profit or loss | 1,523,195,334 | 2,786,027,085 |  |
Derivative financial assets | 1,443,134,162 | 969,894,519 |  |
Financial assets | 2,966,329,496 | 3,755,921,604 |  |
Financial assets at amortized cost, category [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Accounts receivable | 187,673,616 | 86,514,680 |  |
Financial assets included in prepayments, deposits and other receivables | 954,518,603 | 1,196,110 |  |
Due from immediate holding company | 2,239,358,702 | 2,144,975,230 |  |
Other assets | 9,620,468 | 136,065,738 |  |
Restricted cash | 3,239,362 |  |  |
Cash and bank balances | 1,078,411,335 | 526,206,108 |  |
Financial assets | $ 4,472,822,086 | $ 2,894,957,866 |  |

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