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Basis of preparation, significant judgments, and accounting policies, Research and Development Tax Credits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2024
Research and development tax credits [Abstract] |  |
Amount recognized for research and development tax credits | $ 1.2 | $ 2.0
Percentage of sensitivity on remaining unrecognized research and development tax credit |  | 5.00%

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- Definition The amount recognized for research and development tax credits. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The percentage of sensitivity on remaining unrecognized research and development tax credit before it would have a material impact on financial statements. + References No definition available. + Details
Name: | ghrs_PercentageOfSensitivityOnRemainingUnrecognizedResearchAndDevelopmentTaxCreditBeforeMaterialImpact
Namespace Prefix: | ghrs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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