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v3.23.1

Related parties - Transactions with key management personnel (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Related party transactions |  |  |
Sales to a shareholder | $ 0 | $ 0 | $ 16,950
Purchase from a joint venture | 0 | 53,981 | 21,119
Services provided by a company with control from a director of the Company | 30,630 | 90,353 | 0
Legal and professional fee paid on behalf of related companies | $ 0 | $ 9,060 | $ 0

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- Definition The amount of goods purchased by the entity in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2022-03-24 -Paragraph 21 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_21_a&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_PurchasesOfGoodsRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of revenue arising from the sale of goods in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2022-03-24 -Paragraph 21 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_21_a&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of services received in related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2022-03-24 -Paragraph 21 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_21_c&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ServicesReceivedRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure Of Material Related Party Transactions [Abstract] + References No definition available. + Details
Name: | pre_DisclosureOfMaterialRelatedPartyTransactionsAbstract
Namespace Prefix: | pre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expenses settled by the entity on behalf of a related party in related party transactions. + References No definition available. + Details
Name: | pre_SettlementOfExpensesByEntityOnBehalfOfRelatedPartyRelatedPartyTransactions
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration