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Significant Agreements and Contracts - Schedule of Contract Liability Activity (Details) - Chiesi Farmaceutici S.p.A And Chiesi USA, Inc. $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Contract With Customer, Liability [Rollforward]
Opening balance	$ 0
Payments received in advance	159,536
Effect of exchange rate changes on contract liabilities	(2,103)
Ending balance	55,919
Revenue from sale of US license
Contract With Customer, Liability [Rollforward]
Revenue	(78,947)
Revenue from sale of ROW license
Contract With Customer, Liability [Rollforward]
Revenue	(11,721)
Revenue from PAH research and development service performance obligations satisfied during reporting period
Contract With Customer, Liability [Rollforward]
Revenue	(9,555)
Revenue from PH-ILD research and development service performance obligations satisfied during reporting period
Contract With Customer, Liability [Rollforward]
Revenue	$ (1,291)

X

- Definition

Contract With Customer, Liability, Effect Of Change In Exchange Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	goss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contract With Customer, Liability Rollforward

+ References

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X

- Definition

Contract With Customer, Liability, Upfront Payment Received

+ References

No definition available.

+ Details

Name:	goss_ContractWithCustomerLiabilityUpfrontPaymentReceived
Namespace Prefix:	goss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

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- Details

Name:	srt_CounterpartyNameAxis=goss_ChiesiFarmaceuticiS.p.AAndChiesiUSAInc.Member
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=goss_USLicenseMember
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Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=goss_ROWLicenseMember
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X

- Details

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X

- Details

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Period Type: