XML 39 R21.htm IDEA: XBRL DOCUMENT
v3.25.2

Accounts Payable and Related Party (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Payables and Accruals [Abstract] |
Schedule of Accounts Payable | Accounts payable consist of the following: Schedule of Accounts Payable
|  | As of |  |  |  |  |  | As of |  |  |  |
|  | June 30, 2025 |  |  | % |  |  | December 31, 2024 |  |  | % |
Accounts payable to Cytovance, a related party 1 |  | $ | 598,000 |  |  |  | 44 | % |  | $ | 1,183,000 |  |  |  | 31 | %
Accounts payable to University of Minnesota |  |  | 432,000 |  |  |  | 31 | % |  |  | 712,000 |  |  |  | 18 | %
Legal services firm |  |  | — |  |  |  | — | % |  |  | 1,505,000 |  |  |  | 39 | %
Accounts payable |  |  | — |  |  |  | — | % |  |  | 1,505,000 |  |  |  | 39 | %
Other accounts payable |  |  | 344,000 |  |  |  | 25 | % |  |  | 453,000 |  |  |  | 12 | %
Total accounts payable |  | $ | 1,374,000 |  |  |  | 100 | % |  | $ | 3,853,000 |  |  |  | 100 | %
1 | Accounts Payable to Cytovance, a related party, since Cytovance owns greater than 5% of the Company’s issued and outstanding common stock. See Note 7 – Commitments and Contingencies, Significant Agreements.
Schedule of Accounts Payable to Related Party | The details of the Company’s accounts payable to Cytovance were as follows: Schedule of Accounts Payable to Related Party
|  | June 30, 2025 |  |  | June 30, 2024 |
|  | Six Months Ending |
|  | June 30, 2025 |  |  | June 30, 2024 |
|  | (Unaudited) |  |  | (Unaudited) |
Beginning balance |  | $ | 1,183,000 |  |  | $ | 3,515,000 |
Invoices, net |  |  | 626,000 |  |  |  | 778,000 |
Payments in cash |  |  | (364,000 | ) |  |  | (2,641,000 | )
Payments in common stock, at fair value |  |  | — |  |  |  | (810,000 | )
Payments in pre-funded warrants, at fair value |  |  | (847,000 | ) |  |  | — |
Ending balance |  | $ | 598,000 |  |  | $ | 842,000 |

X
- Definition Schedule of Accounts Payable and Related Party [Table Text Block] + References No definition available. + Details
Name: | GTBP_ScheduleOfAccountsPayableAndRelatedPartyTableTextBlock
Namespace Prefix: | GTBP_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration