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Significant Agreements and Contracts - Summary of Contract Liability Activity (Details) - Chiesi $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Contract With Customer, Liability [Rollforward]
Opening balance	$ 0
Payments received in advance	160,000
Equity Option granted to Chiesi	(464)
Effect of exchange rate changes on contract liabilities	1,656
Ending balance	64,107
Revenue from sale of US license
Contract With Customer, Liability [Rollforward]
Revenue	(76,686)
Revenue from sale of ROW license
Contract With Customer, Liability [Rollforward]
Revenue	(12,050)
Revenue from PAH research and development service performance obligation satisfied during reporting period
Contract With Customer, Liability [Rollforward]
Revenue	(8,132)
Revenue from PH-ILD research and development service performance obligation satisfied during reporting period
Contract With Customer, Liability [Rollforward]
Revenue	$ (217)

X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Contract with Customer, Liability, Equity Option Issued

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Contract With Customer, Liability Rollforward

+ References

No definition available.

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- 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_
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Balance Type:	credit
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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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X

- Details

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X

- Details

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X

- Details

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X

- Details

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