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v3.24.3

Share based compensation, Share Options (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 shares | Sep. 30, 2024 shares $ / shares | Jun. 30, 2021 shares
Share based payment arrangement [Abstract] |  |  |
Number of shares reserved for future issuance (in shares) |  |  | 1,202,734
Number of ordinary shares available for future issuance (in shares) | 427,256 | 427,256 |
Number of options granted (in shares) |  | 185,120 |
Exercise price for option granted (in dollars per share) | $ / shares |  | $ 8.07 |
Employees [Member] |  |  |
Share based payment arrangement [Abstract] |  |  |
Number of options granted (in shares) | 30,500 | 152,000 |
Share option award granted period | 8 years | 8 years |
Board of Directors [Member] |  |  |
Share based payment arrangement [Abstract] |  |  |
Number of options granted (in shares) | 16,596 | 33,120 |
Vesting condition |  | 2 years |
Share option award granted period |  | 7 years |
Exercise price for option granted (in dollars per share) | $ / shares |  | $ 0.025 |

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- Definition The number of ordinary shares available for future issuance of share-based equity awards. + References No definition available. + Details
Name: | ghrs_NumberOfOrdinarySharesAvailableForFutureIssuanceOfShareBasedEquityAwards
Namespace Prefix: | ghrs_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Share option award granted period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References No definition available. + Details
Name: | ghrs_ShareOptionAwardGrantedPeriod
Namespace Prefix: | ghrs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition For vesting requirements for a type of share-based payment arrangement that existed at any time during the period, this element represents the period which an employees' right to exercise an award is no longer contingent on satisfaction of a service condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | ghrs_VestingRequirementsForShareBasedPaymentArrangementAwardVestingPeriod
Namespace Prefix: | ghrs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_vii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ghrs_EmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ghrs_BoardOfDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |