XML 163 R151.htm IDEA: XBRL DOCUMENT
v3.23.1

Financial instruments-Fair values and risk management - Group's exposure at the end of the reporting period to currency risk (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
United States of America, Dollars |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in foreign exchange rates | 1.00% | 1.00%
(Decrease) in foreign exchange rates | (1.00%) | (1.00%)
Effect on profit after tax and retained profits, increase in foreign exchange rates | $ 63,061 | $ 67,269
Effect on profit after tax and retained profits, decrease in foreign exchange rates | $ (63,061) | $ (67,269)
China, Yuan Renminbi |  |
Disclosure of detailed information about financial instruments [line items] |  |
Increase in foreign exchange rates | 5.00% | 1.00%
(Decrease) in foreign exchange rates | (5.00%) | (1.00%)
Effect on profit after tax and retained profits, increase in foreign exchange rates | $ 48,298 | $ 13,468
Effect on profit after tax and retained profits, decrease in foreign exchange rates | (48,298) | (13,468)
Currency risk [member] | United States of America, Dollars |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 7,551,223 | (8,027,547)
Currency risk [member] | United States of America, Dollars | Trade receivables [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 79,220 | 373,889
Currency risk [member] | United States of America, Dollars | Deposits And Prepayments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 2,972,471 | 3,899,656
Currency risk [member] | United States of America, Dollars | Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 12,225,385 | 1,231,648
Currency risk [member] | United States of America, Dollars | Trade payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | (3,984,494) | (2,112,494)
Currency risk [member] | United States of America, Dollars | Accrued expenses and other current liabilities. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | (3,741,359) | (11,420,246)
Currency risk [member] | China, Yuan Renminbi |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | (1,156,840) | (1,612,926)
Currency risk [member] | China, Yuan Renminbi | Deposits And Prepayments |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 872,455 | 4,500,406
Currency risk [member] | China, Yuan Renminbi | Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | 14 | 14
Currency risk [member] | China, Yuan Renminbi | Trade payables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk | $ (2,029,309) | (6,113,239)
Currency risk [member] | China, Yuan Renminbi | Accrued expenses and other current liabilities. |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net exposure to currency risk |  | $ (107)

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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 36 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_MaximumExposureToCreditRisk
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increase (decrease) in profit and loss as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | pre_IncreaseDecreaseInProfitAfterTaxAndRetainedProfitsDueToReasonablyPossibleDecreaseInDesignatedRiskComponent
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | pre_IncreaseDecreaseInProfitAfterTaxAndRetainedProfitsDueToReasonablyPossibleIncreaseInDesignatedRiskComponent
Namespace Prefix: | pre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | pre_PercentageOfReasonablyPossibleDecreaseInRiskAssumption
Namespace Prefix: | pre_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | pre_PercentageOfReasonablyPossibleIncreaseInRiskAssumption
Namespace Prefix: | pre_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=pre_DepositsAndPrepaymentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=pre_CashAndCashEquivalentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=pre_TradePayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=pre_AccruedExpensesAndOtherCurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |