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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
	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%

X

- Definition

The amount recognized for research and development tax credits.

+ References

No definition available.

+ Details

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Namespace Prefix:	ghrs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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Namespace Prefix:	ghrs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration