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Accounts Receivable - Summary of trade receivable past due analysis (Detail) - HKD ($) | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Trade Receivable Past Due Analysis [Line Items] |  |
Gross carrying amount | $ 187,673,616 | $ 86,514,680
Credit Grade AA [Member] |  |
Disclosure Of Trade Receivable Past Due Analysis [Line Items] |  |
Expected credit loss rate. | 0.15% |
Gross carrying amount | $ 84,563,000 |
Credit Grade A [Member] |  |
Disclosure Of Trade Receivable Past Due Analysis [Line Items] |  |
Expected credit loss rate. |  | 0.10%
Gross carrying amount |  | $ 54,763,000
Credit Grade BBB [Member] |  |
Disclosure Of Trade Receivable Past Due Analysis [Line Items] |  |
Expected credit loss rate. | 0.27% | 0.17%
Gross carrying amount | $ 103,111,000 | $ 24,218,000
Credit Grade CCC [Member] |  |
Disclosure Of Trade Receivable Past Due Analysis [Line Items] |  |
Expected credit loss rate. |  | 0.10%
Gross carrying amount |  | $ 7,534,000

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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph IG20D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2022-03-24 + Details
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