XML 110 R98.htm IDEA: XBRL DOCUMENT v3.23.1

Goodwill - Summary of goodwill balance allocated to CGU's (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 33,800,276	$ 3,978,065	$ 3,993,007
Prevention EMEA within the Prevention segment
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	0	855,284
Diagnostics EMEA within the Diagnostics segment
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	0	3,122,781
Cancer genetic testing services within the Diagnostics segment [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	30,639,976	0
Sales of medical diagnostics products within the Diagnostics segment [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Goodwill	$ 3,160,300	$ 0

X

- 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

Name:	ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2022-03-24
-Paragraph 134
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2022-en-r&anchor=para_134_a&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2022-03-24
-Paragraph 135
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2022-en-r&anchor=para_135_a&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2022-03-24
-Paragraph B67
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2022-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B
-URIDate 2022-03-24

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 54
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_Goodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=pre_PreventionEmeaWithinPreventionSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=pre_DiagnosticsEmeaWithinDiagnosticsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=pre_CancerGeneticTestingServicesWithinTheDiagnosticsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsAxis=pre_SalesOfMedicalDiagnosticsProductsWithinTheDiagnosticsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: