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Fair value and fair value hierarchy of financial instruments - Additional information (Detail) - HKD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items] |  |  |
Transfer between levels during period | $ 0 | $ 0 |
Financial assets at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Unrealized gain (loss) | 216,520,744 | $ 321,851,173 | $ 22,842,231
Gain from disposal of financial assets | $ 168,063,704 |  |

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- Definition Transfers Out Of Into Level1 Level2 And Level3 Of Fair Value Hierarchy Assets + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2022-03-24 -Paragraph 93 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_f&doctype=Standard -URIDate 2022-03-24 + Details
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- Details
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