Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Significant Accounting Policies us-gaap_IncomeTaxExpenseBenefit Income Tax Expense (Benefit) Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies and Liquidity mbrx_LicenseAgreementsExpense License Agreements Expense The amount of expense for licensing agreements. ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Accrued Expenses and Other Current Liabilities ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 4 - Warrants and Equity Common stock issued upon vesting of restricted stock units (net of taxes) (in shares) Trading Arrangements, by Individual [Table] Note 5 - Stock-based Compensation Material Terms of Trading Arrangement [Text Block] Note 7 - Commitments and Contingencies Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies and Liquidity - Prepaid Expenses and Other Current Assets (Details) Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies and Liquidity - Schedule of Fair Value Measurements, Recurring and Nonrecurring (Details) Note 2 - Basis of Presentation, Principles of Consolidation and Significant Accounting Policies and Liquidity - Change in Accounting Policy (Details) Note 3 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) Minimum [Member] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) Note 3 - Accrued Expenses and Other Current Liabilities - Accrued Expenses and Other Current Liabilities (Details) (Parentheticals) Note 4 - Warrants and Equity - Assumptions Used (Details) Statistical Measurement [Domain] Note 4 - Warrants and Equity - Warrant Activity (Details) Note 5 - Stock based Compensation - Stock based Compensation Expense (Details) Cash flows from operating activities: Note 5 - Stock based Compensation - Stock based Compensation Expense 2 (Details) Note 7 - Commitments and Contingencies - Lease Cost (Details) Notes To Financial Statements mbrx_ClassOfWarrantOrRightExercisedDuringPeriod Exercised, number of shares under warrants (in shares) The number of warrants or rights exercised during period. Notes To Financial Statements [Abstract] Granted, number of shares under warrants (in shares) Class of Warrant or Right, Issued During Period (in shares) The number of warrants or rights issued during period. Exercisable, Exercise Price (in dollars per share) Exercise price per share or per unit of warrants or rights vested and exercisable. Balance, Weighted Average Remaining Contractual Life (Year) The weighted average remaining contractual life of warrants or rights outstanding. us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities Granted, weighted average remaining contractual life (Year) The weighted average remaining contractual life of warrants or rights granted during the period. Net cash used in investing activities Granted, Exercise Price (in dollars per share) Exercise price per share of warrants or rights issued during period. us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share (in dollars per share) Exercised, Exercise Price (in dollars per share) Exercise price per share of warrants or rights exercised during period. us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities Liability Classified Warrants [Member] Represents liability classified warrants. The 2024 Stock Plan [Member] Represents the 2024 stock plan. Fair value of warrant liability Counterparty Name [Axis] Warrants reclassification Amount of warrants amended from liability measured at fair value on recurring basis using unobservable input (level 3). us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Equity Classified Warrants [Member] Represents equity classified warrants. Exercised, weighted average remaining contractual life (Year) The weighted average remaining contractual life of warrants or rights exercised during the period. Reverse Stock Split [Member] Related to the reverse stock split. Prepaid Expenses and Other Current Assets [Policy Text Block] Disclosure of the accounting policy for prepaid expenses and other current assets. Accounting Policies [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Interest income (expense), net Warrants and Equity [Text Block] Disclosure for both warrants and equity. Weighted Average [Member] Measurement Input Type [Axis] Counterparty Name [Domain] Income Statement [Abstract] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Measurement Input, Expected Dividend Rate [Member] mbrx_ClassOfWarrantOrRightExpired Expired warrants, number of shares under warrants (in shares) Represents the number of warrants or rights expired during the period. Measurement Input, Expected Term [Member] Change in fair value of warrant liability Gain (loss) from change in fair value of warrant liability Gain (loss) from change in fair value of warrant liability Consolidated net loss Net loss Net loss Net loss Adjustments to reconcile net loss to net cash used in operating activities: Measurement Input, Price Volatility [Member] us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net loss available to common stockholders Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued or outstanding Plan Name [Axis] us-gaap_Liabilities Total liabilities Plan Name [Domain] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Series H Warrants [Member] Represents series H warrants. us-gaap_WarrantsAndRightsOutstandingTerm Warrants and Rights Outstanding, Term (Year) Share-Based Payment Arrangement, Expense Share-Based Payment Arrangement, Expense us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity Measurement Input Type [Domain] us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses and other assets Measurement Input, Risk Free Interest Rate [Member] us-gaap_ShareBasedCompensation Stock-based compensation Subsequent Event [Member] Income Tax Disclosure [Text Block] Warrants, assumptions Share-Based Payment Arrangement [Text Block] Location, Statement of Income, Balance [Axis] Changes in operating assets and liabilities: us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable Preferred stock, shares issued (in shares) Accounting Standards Update and Change in Accounting Principle [Table] Preferred stock, shares outstanding (in shares) Preferred stock, shares authorized (in shares) Accounting Standards Update and Change in Accounting Principle [Table Text Block] mbrx_OperatingLeaseMonthlyRentPayment Operating Lease, Monthly Rent Payment Represents the amount of monthly rent payment on an operating lease. Preferred stock, par value (in dollars per share) Accrued expenses and other current liabilities us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue Balance Balance us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase (decrease) in cash and cash equivalents us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash and cash equivalents - beginning of period Cash and cash equivalents - end of period Deemed dividend in connection with warrant amendment Deemed dividend in connection with warrant amendments Deemed dividends in connection with warrant amendments Warrant, Down Round Feature, Decrease in Net Income to Common Shareholder, Amount Warrant deemed dividend Effect of exchange rate changes on cash and cash equivalents Warrant inducement and exercise of common stock warrants Value of stock issued as a result of the exercise of inducement warrants. Warrant inducement and exercise of common stock warrants (in shares) Number of inducement warrants exercised during the current period. New Accounting Pronouncements, Policy [Policy Text Block] Equity warrants issued Legal, regulatory, professional and other Carrying value as of the balance sheet date of obligations incurred through that date and payable for legal, regulatory, professional and other costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Statement [Table] Reclassification, Comparability Adjustment [Policy Text Block] Pre-funded Warrants [Member] In connection to Pre-funded Warrants. us-gaap_OperatingLeasePayments Operating Lease, Payments Prepaid insurance Reclassification of warrant liabilities to equity upon contractual reset of exercise price mbrx_AdjustmentsToAdditionalPaidInCapitalWarrantReclassificationFromLiabilitiesToEquity Amount of warrant reclassification from liabilities to equity. Fair Value Hierarchy and NAV [Domain] Measurement Frequency [Domain] Other income (loss): Statement of Financial Position [Abstract] Intangible assets us-gaap_EquityMethodInvestmentOwnershipPercentage Equity Method Investment, Ownership Percentage mbrx_PolicyTable Nature of Operations [Text Block] Issuance of common stock in connection with Consulting Agreements Issuance of common stock in connection with Consulting Agreements (in shares) Offering costs included in accounts payable and accrued liabilities Offering cost incurred that was non-cash or partial non-cash. Fair Value, Recurring [Member] Other non-current assets Nonmonetary Transaction Type [Domain] Nonmonetary Transaction Type [Axis] Revision of Prior Period [Domain] Revision of Prior Period [Axis] Document Type Operating expenses: Document Information [Line Items] Document Quarterly Report Document Information [Table] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Entity Interactive Data Current mbrx_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedAmount Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Measurement Frequency [Axis] Document Transition Report Commitments and Contingencies Disclosure [Text Block] Statement [Line Items] Liability Class [Axis] us-gaap_OperatingExpenses Total operating expenses Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] Fair Value Hierarchy and NAV [Axis] Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Common stock, shares authorized (in shares) Weighted average common shares outstanding, basic and diluted (in shares) Schedule of Accrued Liabilities [Table Text Block] Net loss per common share - basic and diluted (in dollars per share) Net loss per common share - basic and diluted (in dollars per share) The 2025 ATM Agreement [Member] The 2025 ATM Agreement. Common stock, $0.001 par value; 500,000,000 shares authorized; 7,100,000 and 3,199,228 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively Effective Income Tax Rate Reconciliation [Table] us-gaap_ProceedsFromIssuanceOrSaleOfEquity Proceeds from Issuance or Sale of Equity Fair Value of Financial Instruments, Policy [Policy Text Block] Exercise Price of Warrants (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) Balance, Exercise Price (in dollars per share) Balance, Exercise Price (in dollars per share) Earnings Per Share, Policy [Policy Text Block] Accounts payable us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Document Fiscal Period Focus Document Fiscal Year Focus Investment, Name [Domain] us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 Stockholders' Equity Note, Stock Split, Conversion Ratio us-gaap_ComprehensiveIncomeNetOfTax Comprehensive loss Amendment Flag us-gaap_SubleaseIncome Sublease Income Subsequent Events [Text Block] Accrued Liabilities, Current Accrued expenses and other current liabilities Document Period End Date Variable lease cost Legal Entity [Axis] Payroll and bonuses Significant Accounting Policies [Text Block] Operating lease cost us-gaap_LeaseCost Total Proceeds from sale of common stock, pre-funded and common warrants and warrant inducement, net of issuance and transaction costs Amount of cash inflow from sale of common stock and warrants, net of issuance costs. Entity File Number Operating lease liability - long-term, net of current portion Entity Tax Identification Number Non-cash investing and financing activities: Operating lease liability - current Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Issued for cash - sale of common stock, pre-funded and common warrants Represents the value of common stock, pre-funded warrants, and common warrants issued for cash. Research and development Research and Development Expense Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Loss from operations Common Stock Outstanding [Member] us-gaap_Cash Cash Class of Warrant or Right [Table] us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings Change in fair value - net Revenues Warrant liability Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Loss Contingencies [Table] Transaction costs allocated to warrant liabilities Represents the proceeds from transaction costs of warrant liabilities. Entity Address, City or Town mbrx_WarrantLiabilitiesTransactionCosts Transaction costs allocated to warrant liabilities Transaction costs allocated to warrant liabilities Represents the transaction costs allocated to warrant liabilities. Accumulated deficit Retained Earnings (Accumulated Deficit) Entity Address, Address Line One Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Statement of Cash Flows [Abstract] City Area Code Foreign currency translation Cumulative translation adjustment Local Phone Number Entity Address, Postal Zip Code Issued for cash - sale of common stock, pre-funded and common warrants (in shares) Represents the shares issued during period, sale of common stocks and warrants. Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Other comprehensive income (loss) Stockholders' equity Title of 12(b) Security Equity Components [Axis] Security Exchange Name Trading Symbol us-gaap_PaymentsOfStockIssuanceCosts Payments of Stock Issuance Costs Class of Stock [Axis] Accrued Expenses and Other Current Liabilities [Table] Equity Component [Domain] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 1 [Member] AOCI Attributable to Parent [Member] Entity Common Stock, Shares Outstanding Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table] Additional Paid-in Capital [Member] us-gaap_ClassOfWarrantOrRightOutstanding Balance, number of shares under warrants (in shares) Balance, number of shares under warrants (in shares) Other comprehensive income (loss): Retained Earnings [Member] Reverse Stock Split [Policy Text Block] Disclosure of the company's policy regarding reverse stock splits. Research and development mbrx_AccruedResearchAndDevelopmentCurrent Carrying value as of the balance sheet date of obligations incurred through that date and payable for research and development. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Furniture and equipment, net Going Concern Policy [Policy Text Block] Disclosure of accounting policy for going concern. Subsequent Event Type [Domain] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Proceeds from exercise of warrants Proceeds from Warrant Exercises Sale of Stock [Axis] Common stock, par value (in dollars per share) Investment, Name [Axis] Warrants issued Stock-based compensation Basis of Accounting, Policy [Policy Text Block] Previously Reported [Member] Warrant Liability Long Term [Member] Information pertaining the long term warrant liability. Reclassed to equity warrants, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price of warrants or rights reclassified during period. Other income, net us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements Warrants exercised Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Sale of Stock [Domain] us-gaap_Assets Total assets Reclassed to equity warrants, weighted average remaining contractual life (in dollars per share) The weighted average remaining contractual life of warrants or rights reclassified during the period. Cash and Cash Equivalents, Policy [Policy Text Block] mbrx_OperatingLeaseRentExpenseAnnualIncreaseInRentPercent Operating Lease, Rent Expense, Annual Increase In Rent, Percent Represents percentage of annual increase in rent for operating lease rent expense. Common Stock Warrants Member] Represents common stock warrants. Reclassed to equity warrants, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price of warrants or rights reclassified during period. Reclassed to equity warrants, Exercise Price of Warrants or Rights (in dollars per share) Represents the exercise price of warrants or rights reclassified during the period. Cash and cash equivalents mbrx_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsLowerLimit Balance, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Balance, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price per share or per unit of warrants or rights outstanding. Adjustment for VWAP, number of shares under warrants (in shares) The increase or decrease in the number of warrants due to adjustment for VWAP. Exercised, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price per share of warrants or rights exercised during period. Expired warrants, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price of warrants or rights expired during period. Liabilities, Current [Abstract] Adjustment for VWAP, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price of warrants or rights adjusted for VWAP during period. Exercised, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price per share of warrants or rights exercised during period. Granted, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price per share of warrants or rights issued during period. Adjustment for VWAP, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price of warrants or rights adjusted for VWAP during period. us-gaap_LiabilitiesCurrent Total current liabilities Granted, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price per share of warrants or rights issued during period. mbrx_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsUpperLimit Balance, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Balance, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price per share or per unit of warrants or rights outstanding. Non-trade receivables Exercisable, weighted average remaining contractual life (Year) The weighted average remaining contractual life of warrants or rights exercisable. Adjustment for VWAP, Weighted Average Remaining Contractual Life (Year) The weighted average remaining contractual life of warrants or rights adjusted for VWAP during the period. Exercisable, number of shares under warrants (in shares) Number of warrants or rights exercisable. Exercisable, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price per share or per unit of warrants or rights exercisable. Adjustment for VWAP, Exercise Price (in dollars per share) Exercise price of warrants or rights adjusted for VWAP during the period. Expired warrants, Exercise Price of Warrants or Rights, Upper Limit (in dollars per share) Upper limit of exercise price of warrants or rights expired during period. Depreciation and amortization Exercisable, Exercise Price of Warrants or Rights, Lower Limit (in dollars per share) Lower limit of exercise price per share or per unit of warrants or rights exercisable. Cash flows from investing activities: Transaction costs related to the sale of common stock, pre-funded and common warrants, and warrant inducements The non cash costs related to the warrant liabilities. Warrants exercised The amount of stock issued during the period for warrant exercises. Lease, Cost [Table Text Block] Warrants exercised (in shares) The number of shares of stock issued during the period for warrant exercises. Operating lease, net The amount of noncash expense for operating lease, net. Consolidation, Policy [Policy Text Block] Fair Value by Liability Class [Domain] Cash flows from financing activities: Schedule of Warrants or Rights, Assumptions Used [Table Text Block] The tabular disclosure for assumptions used for warrants or rights. Equity warrants issued in relation to liability classified warrant inducements The value of equity warrants issued from warrant liability inducements. Schedule of Warrant Activity [Table Text Block] The tabular disclosure for warrant activity. Accumulated other comprehensive income (loss) Animal Life Sciences, Inc [Member] Represents Animal Life Sciences, Inc. mbrx_NumberOfCoreDrugTechnologies Number of Core Drug Technologies The number of core drug technologies. Reclassification of warrant liabilities to equity upon contractual reset of exercise price The reclassification of warrant liabilities to equity. Warrant deemed dividend Warrant deemed dividends. Warrant Liability [Member] Represents warrant liability. General and administrative Series F Warrants [Member] Relating to Series F warrants. Vendor prepayments and deposits Amount of consideration and deposits paid in advance to vendors. Prepaid sponsored research The amount of prepaid sponsored research classified as current. Proceeds from issuance of common stock under at-the-market equity program, net of transaction costs Amount of cash inflow from sale of common stock net of issuance costs. Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Additional paid-in capital Subsequent Events, Policy [Policy Text Block] Loss on issuance of warrant liabilities Loss on issuance of warrant liabilities Loss on issuance of warrant liabilities In reference to the loss on issuance of warrant liabilities. us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Segment Reporting, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Prepaid expenses and other current assets Total prepaid expenses and other current assets Series G Warrants [Member] Series G Warrants mbrx_AtMarketIssuanceSalesAgreementMaximumAggregateOfferingPrice At Market Issuance Sales Agreement, Maximum Aggregate Offering Price The maximum aggregate offering price of the at market issuance sales agreement. Series E and F Warrants [Member] Series E and F Warrants Issuance of common stock under at-the-market equity program, net of transaction costs Nature of Operation, Product Information, Concentration of Risk [Table] MD Anderson [Member] Represents MD Anderson. Current assets: Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Series E Warrants [Member] Series E Warrants mbrx_AtMarketIssuanceSalesAgreementCommissionFeePercentageOfGrossProceeds At Market Issuance Sales Agreement, Commission Fee, Percentage of Gross Proceeds The commission fees expressed as a percentage of gross proceeds under the at market issuance sales agreement. Operating lease right-of-use asset Reclassed to equity warrants, number of shares (in shares) Reclassed to equity warrants, number of shares (in shares) The number of warrants reclassified. Common stock issued upon vesting of restricted stock units (net of taxes) us-gaap_AssetsCurrent Total current assets Fair Value, Recurring and Nonrecurring [Table] Series I Warrants [Member] Series I Warrants ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] August 2026 Public Offering [Member] August 2026 Public Offering Issuance of common stock under at-the-market equity program, net of transaction costs (in shares) Stock Issued During Period, Shares, New Issues (in shares) Commitments and contingencies (Note 7)