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Derivative Liability (Details Narrative) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Liability |  |  |  |
Derivative, Gain on Derivative | $ 5,000 |  | $ 23,000 |
[custom:ChangeInFairValueOfDerivativeLiability] |  | $ 480,000 |  | $ 459,000

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- Definition Change in fair value of derivative liability. + References No definition available. + Details
Name: | GTBP_ChangeInFairValueOfDerivativeLiability
Namespace Prefix: | GTBP_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainOnDerivative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration