XML 85 R73.htm IDEA: XBRL DOCUMENT
v3.23.1

Significant accounting policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Significant accounting policies |
Schedule of estimated useful lives of property and equipment |
|  | – |  | Properties leased for own use |  | Over the unexpired lease period
|  | – |  | Office equipment leased for own use |  | Over the unexpired lease period
|  | – |  | Leasehold improvements |  | Shorter period of the lease term or the useful life
|  | – |  | Fixtures and furniture |  | 3 - 5 years
|  | – |  | Office and lab equipment |  | 3 - 5 years
|  | – |  | Computer equipment |  | 3 years
|  | – |  | Motor vehicles |  | 3 - 5 years
|  | – |  | Manufacturing equipment |  | 3 - 5 years
Schedule of estimated useful lives of intangible assets |
–   Website and mobile apps |  | 2 years
–   Trademark and technology |  | 10 - 20 years
–   Products development cost |  | 3 years
–   Computer software |  | 3 years
–   Customer relationship |  | 10 years

X
- Definition Disclosure of detailed information about estimated useful lives of intangible assets. + References No definition available. + Details
Name: | pre_DisclosureOfEstimatedUsefulLivesOfIntangibleAssetsTableTextBlock
Namespace Prefix: | pre_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of detailed information about estimated useful lives of property, plant and equipment. + References No definition available. + Details
Name: | pre_DisclosureOfEstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTextBlock
Namespace Prefix: | pre_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | pre_DisclosureOfSummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | pre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration