XML 47 R28.htm IDEA: XBRL DOCUMENT
v3.25.1

Accounts Payable and Related Party (Details Narrative) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Feb. 26, 2025
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Exercise price |  |  |  | $ 2.8375
Cytovance Biologics Inc [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Issuance of pre-funded warrants | 326,251 | 326,251 |  |
Exercise price | $ 0.0001 | $ 0.0001 |  |
Payments in pre-funded warrants, at fair value |  | $ 847,000 |  |
Legal Services Firm [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Prior year unpaid fees | $ 1,000,000 |  |  |

X
- Definition Repayments of prefunded warrants at fair value. + References No definition available. + Details
Name: | GTBP_RepaymentsOfPrefundedWarrantsAtFairValue
Namespace Prefix: | GTBP_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash outflow for fees classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_PaymentsForFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=GTBP_CytovanceBiologicsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=GTBP_LegalServicesFirmMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |