Condensed Consolidated Balance Sheets [Abstract] Total current assets Total assets Total current liabilities Total liabilities Total stockholders' equity Balance Balance Total liabilities and stockholders’ equity Condensed Consolidated Statements of Loss and Comprehensive Loss [Abstract] Loss from operating activities Total other income (expense), net Other segment expense Loss before income tax benefit Net loss Net loss Condensed Consolidated Statements of Stockholders’ Equity [Abstract] Balance (in Shares) Balance (in Shares) Equity Components [Axis] Condensed Consolidated Statements of Cash Flows [Abstract] Net cash used in operating activities Net cash used in financing activities Net decrease in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Nature of operations [Abstract] Summary of significant accounting policies [Abstract] Fair value measurements [Abstract] Cash and Cash Equivalents [Axis] Measurement Frequency 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Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Assets Current assets: Cash and cash equivalents Receivables Prepaid expenses Equipment, net Intangible assets Liabilities and Stockholders’ equity Current liabilities: Deferred tax liability Commitments and contingencies (Note 11) Stockholders’ equity: Preferred stock, $0.0001 par value per share; 10,000,000 authorized; none issued and 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outstanding, basic (in Shares) Weighted average number of shares outstanding, diluted (in Shares) Issuance of common stock upon cashless exercise of pre-funded warrants Issuance of common stock upon cashless exercise of pre-funded warrants (in Shares) Warrants exercised into common stock (in Shares) Stock-based compensation Cash flows from operating activities: Adjustments: Depreciation expense Stock-based compensation Impairment of intangible assets Impairment of intangible assets Impairment Write-off of IPR&D impairment charges Change in fair value of derivative warrant liabilities Change in fair value of derivative warrant liabilities Changes in operating assets and liabilities: Trade and other payables Cash flows from financing activities: Cash and cash equivalents are comprised of: Cash Cash equivalents Research and development expenses Clinical development programs General and administrative expenses Income tax benefit Income tax benefit Provision for income taxes Income tax 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[Member] Significant Unobservable Inputs (Level 3) [Member] GTX 104 [Member] GTX 102 [Member] GTX 101 [Member] In Process Research and Development [Member] September 2023 Pre-Funded Warrants [Member] February 2025 Common Warrants [Member] February 2025 Pre-Funded Warrants [Member] 2024 Plan and Prior Plan [Member] Location, Statement of Income, Balance [Axis] Equity Incentive Plan 2024 [Member] 2024 Plan and Prior Plan [Member] Employee Stock Option [Member] 2023 Common Warrants [Member] 2025 Common Warrants [Member] Operating Segments [Member] Subsequent Event Type [Axis] Sale of Stock [Axis] Intangible Asset, Finite-Lived, Class [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Rule 10b5-1 Arrangement Adopted [Flag] Non-Rule 10b5-1 Arrangement Adopted [Flag] Rule 10b5-1 Arrangement Terminated [Flag] Non-Rule 10b5-1 Arrangement Terminated [Flag] Net proceeds Number of shares of common stock that can be purchased with warrants (in Shares) Warrant expiration date Share 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[Abstract] Intangible Asset, Indefinite-Lived, Class [Domain] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Intangible assets and goodwill [Abstract] Class of Warrant or Right [Domain] Class of Warrant or Right [Table] Stockholders’ equity [Abstract] Plan Name [Domain] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Stock-based compensation [Abstract] Antidilutive Securities, Name [Domain] Antidilutive Security, Excluded EPS Calculation [Table] Loss per share [Abstract] Segments [Domain] Schedule of Segment Reporting Information, by Segment [Table] Segment Information [Abstract] Sale of Stock [Domain] Subsequent Event Type [Domain] Subsidiary or Equity Method Investee, Sale of Stock [Table] Nature of operations [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived [Table] Intangible assets and goodwill [Abstract] Segment Reporting [Table] Purchase Commitment, Excluding Long-Term 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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Warrant expiration date. Common Warrant 2025 2025 Common Warrants Information about development and production of clinical materials. Information about development and production of clinical materials. Equity incentive plan which allows for the issuance of options for shares of common stock and share appreciation rights. An equity incentive program offers an employee shares of the company they work for. Shares can be awarded through stock options, stocks, warrants, or bonds. Stock options are the most common and recognizable form of employee equity. A common warrant represents the right to purchase a company's stock at a specific price and at a specific date. In process investigation of new knowledge useful in developing GTX 101. In process investigation of new knowledge useful in developing GTX 102. In process investigation of new knowledge useful in developing GTX 104. Pre-funded Warrants [Member] 2023 Pre-funded Warrants 2025 Pre-funded Warrants A 2025 private placement is a direct offering of securities to a limited number of sophisticated investors such as insurance companies, pension funds, mezzanine funds, stock funds and trusts. Reportable operating segment: the development and commercialization of pharmaceutical applications of its patents and licensed rights. A common warrant represents the right to purchase a company's stock at a specific price and at a specific date. The Company has one reportable operating segment. Represents the stock option plan. This category includes information about negotiable debt securities issued by the United States Department of the Treasury which generally have maturities of one year or less and term deposits. 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Remaining Minimum Amount Committed Entity Shell Company Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Security Exchange Name Location, Statement of Income, Balance [Axis] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Intangible Asset, Excluding Goodwill, Indefinite-Lived Assets, Fair Value Disclosure Other Selling, General and Administrative Expense Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Common Stock, Shares, Outstanding Cash and Cash Equivalents, Fair Value Disclosure Retained Earnings (Accumulated Deficit) Reportable Operating Segment Member Liabilities, Fair Value Disclosure Depreciation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Single Reportable Segment Member September2023 Common Warrants Member Contract Research Organizations Member Nontrade Receivables, Current Prefunded Warrants2023 Member Fair Value, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Machinery and Equipment, Gross Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Preferred Stock, Shares Outstanding Goodwill, Impairment Loss Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Entity Incorporation, State or Country Code Equity Incentive Plan2024 Member Entity Address, Address Line One Preferred Stock, Shares Authorized Common Stock, Shares Authorized Non-Rule 10b5-1 Arrangement Adopted [Flag] Employee-related Liabilities, Current Subsequent Event [Member] Other Accrued Liabilities, Current Amendment Flag Share-Based Payment Arrangement, Expense Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Deferred Income Tax Liabilities, Net Class of Warrant or Right, Number of Securities Called by Warrants or Rights Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Additional Paid-in Capital [Member] Common Warrant2025 Member In Process Research and Development [Member] Operating Income (Loss) Share-Based Payment Arrangement, Option [Member] Intangible Asset, Finite-Lived, Acquired [Line Items] Entity Central Index Key Increase (Decrease) in Prepaid Expense Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Treasury Bills And Term Deposits Member Ou Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Termtstanding Remaining Contractual Termyears Significant Accounting Policies [Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Goodwill Entity Registrant Name Commitments and Contingencies Interest Income (Expense), Nonoperating Common Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Accounts Payable and Accrued Liabilities Disclosure [Text Block] AOCI Attributable to Parent [Member] Class of Warrant or Right, Outstanding Insider Trading Arrangements [Line Items] Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Income Tax Disclosure [Text Block] Fair Value, Inputs, Level 3 [Member] Gtx104 Member Realized Gain (Loss), Foreign Currency Transaction, before Tax Liabilities, Current [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Increase (Decrease) in Receivables Intangible Asset and Goodwill [Text Block] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accrued Research And Development Expense APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Stock Option Plan Member Loss Contingency Accrual Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, 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Stated Value Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Segment Reporting [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Intangible Asset, Excluding Goodwill, Indefinite-Lived [Abstract] Proceeds from Issuance of Private Placement Entity Current Reporting Status Entity Emerging Growth Company Assets, Current Common Stock, Shares, Issued Entity Address, Postal Zip Code Private Placement2025 Member Weighted Average Number of Shares Outstanding, Diluted Document Fiscal Period Focus Rule 10b5-1 Arrangement Adopted [Flag] Preferred Stock, Shares Issued Intangible Asset, Impairment [Table Text Block] Private Placement [Member] Intangible Asset, Excluding Goodwill, after Accumulated Amortization Common Warrants2025 Member Fair Value Disclosures [Text Block] Warrant Expiration Date Document Transition Report Net Income (Loss) Attributable to Parent Share-Based Payment Arrangement, Option, 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