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Liabilities for puttable financial instrument - Schedule of liabilities for puttable financial instrument (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Liabilities For Puttable Financial Instrument [Abstract] |  |
Balance at January 1 | $ 14,309 | $ 14,623
Change in fair value recognized in equity | 211 | (314)
Eliminated on disposal of a subsidiary | (14,520) | 0
Balance at December 31 | $ 0 | $ 14,309

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- Definition The increase (decrease) in the fair value measurement of liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2025-01-01 -Paragraph 93 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInFairValueMeasurementLiabilities
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 Decrease Through Loss Of Control Of Subsidiary, Financial Liabilities + References No definition available. + Details
Name: | pre_DecreaseThroughLossOfControlOfSubsidiaryFinancialLiabilities
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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