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v3.23.1

Segment information - Additional information (Details) - customer | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of credit risk exposure [line items] |  |  |
Number of customers | 2 |  | 2
Percentage of revenue | 10.00% |  | 10.00%
Customer one |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of revenue | 28.00% | 14.00% | 20.00%
Customer two |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Percentage of revenue | 27.00% | 11.00% | 20.00%

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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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Period Type: | duration

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- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2022-03-24 -Paragraph 34 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2022-en-r&anchor=para_34&doctype=Standard -URIDate 2022-03-24 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of customers. + References No definition available. + Details
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Namespace Prefix: | pre_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |