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Schedule of Warrant Liability Transactions (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Warrant Liability
Beginning balance	$ 252,000	$ 1,052,000
Issuance of warrants at fair value
Change in fair value	(244,000)	(870,000)
Extinguishment
Ending balance	$ 8,000	$ 182,000

X

- References

No definition available.

+ Details

Name:	GTBP_DisclosureWarrantLiabilityAbstract
Namespace Prefix:	GTBP_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Extinguishment of warrant.

+ References

No definition available.

+ Details

Name:	GTBP_ExtinguishmentOfWarrant
Namespace Prefix:	GTBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Warrant liability current.

+ References

No definition available.

+ Details

Name:	GTBP_WarrantLiabilityCurrent
Namespace Prefix:	GTBP_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The increase (decrease) during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_IncreaseDecreaseInDerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration