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Liabilities for puttable financial instrument - Schedule of liabilities for puttable financial instrument (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($)
Liabilities for puttable financial instrument [Abstract] |
Beginning balance | $ 0
Issuance of puttable financial instrument | 17,138,905
Ending balance | $ 17,138,905

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- Definition The expected cash outflow on the redemption or repurchase of puttable financial instruments classified as equity. [Refer: Liquidity risk [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 136A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_136A_c&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ExpectedCashOutflowOnRedemptionOrRepurchaseOfPuttableFinancialInstruments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Current liabilities for puttable financial instrument. + References No definition available. + Details
Name: | pre_CurrentLiabilitiesForPuttableFinancialInstrument
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liabilities for puttable financial instrument. + References No definition available. + Details
Name: | pre_LiabilitiesForPuttableFinancialInstrumentAbstract
Namespace Prefix: | pre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration