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Schedule of Derivative Liability Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Warrant Liability |  |
Beginning balance | $ 1,052,000 | $ 18,000
Issuance of warrants at fair value |  | 5,831,000
Change in fair value | (800,000) | (4,797,000)
Extinguishment |  |
Ending balance | $ 252,000 | $ 1,052,000

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- References No definition available. + Details
Name: | GTBP_DisclosureWarrantLiabilityAbstract
Namespace Prefix: | GTBP_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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