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Interest received Net loss for the period Net loss for the period Net loss for the period ifrs-full_CashFlowsFromUsedInOperations Cash flow used in operations Historical volatility for shares, measurement input [member] Statement of cash flows [abstract] Operating activities: ifrs-full_RevenueFromContractsWithCustomers Revenue from contracts with customers Non-adjusting events after reporting period [domain] ifrs-full_GeneralAndAdministrativeExpense General and administrative Trade payables evax_ShareBasedCompensationExpirationPeriod Share based compensation, expiration period (Year) Represents the expiration period of a share based compensation award. 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Document Information [Line Items] ifrs-full_InterestIncomeOnOtherFinancialAssets Interest income, other ifrs-full_Liabilities Total liabilities Carrying amount as of January 1, 2026 Carrying amount as of June 30, 2026 Unobservable inputs [domain] Reserve of exchange differences on translation [member] Document Information [Table] ifrs-full_ProfitLossBeforeTax Net loss before tax ifrs-full_InterestIncomeOnCashAndCashEquivalents Interest income, bank Share premium [member] Exchange rate translation effects on working capital The effect of exchange rate translation effects on working capital. Components of equity [axis] Issued capital [member] MSD [member] Represents MSD, tradename of Merck & Co., Inc. Major ordinary share transactions [member] Exchange differences on currency translation to presentation currency Non-adjusting events after reporting period [axis] Disclosure of non-adjusting events after reporting period [table] Other comprehensive income that may be reclassified to profit or loss in subsequent periods: Disclosure of non-adjusting events after reporting period [text block] evax_DecreaseInFairValueMeasurementLiabilities Change in fair value of derivative liability The decrease in the fair value measurement of liabilities. evax_IncreaseInFairValueMeasurementLiabilities Change in fair value of derivative liability The increase decrease in the fair value measurement of liabilities. Financial income and expenses [text block] Schedule of financial income and expenses. Other comprehensive income that will not be reclassified to profit or loss in subsequent periods: Amendment Flag ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent Total comprehensive loss attributable to shareholders of Evaxion A/S Disclosure of changes in accounting estimates [table] JonesTrading Institutional Services LLC [member] Represents JonesTrading Institutional Services LLC. Legal Entity [Axis] ifrs-full_ParValuePerShare Par value per share (in DKK per share) Share capital, shares (in shares) ifrs-full_NumberOfSharesOutstanding Number of shares outstanding (in shares) Oil and Gas, Delivery Commitment [Table] Cash and cash equivalents Cash and cash equivalents at January 1 Cash and cash equivalents at June 30 ifrs-full_NumberOfSharesIssued Number of shares issued (in shares) ifrs-full_Assets TOTAL ASSETS Disclosure of classes of share capital [table] Warrants granted Number of other equity instruments granted in share-based payment arrangement Receivables Entity [Domain] Entity Central Index Key Entity Registrant Name Disclosure of commitments and contingent liabilities [text block] Share-based compensation Disclosure of classes of share capital [text block] Disclosure of material accounting policy information [text block] Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] Share capital ifrs-full_Equity Total equity Equity Equity Depreciation ifrs-full_CurrentAssets Total current assets ifrs-full_ComprehensiveIncome Total comprehensive loss Other comprehensive income Other comprehensive (loss)/ income for the period, net of tax ifrs-full_AdjustmentsForFinanceIncome Reversal of finance income Issuance of shares for cash Issue of equity Property and equipment, net ifrs-full_AdjustmentsForFinanceIncomeCost Reversal of finance expense Changes in equity [abstract] Current assets Tax receivables, current Reversal of tax charge Name of Property [Domain] ifrs-full_NoncurrentAssets Total non-current assets Name of Property [Axis] Tax receivables, non-current ifrs-full_NoncurrentLiabilities Total non-current liabilities Share Repurchase Program [Table] Non-current assets Trade payables, accrued expenses and other payables Counterparties [axis] Disclosure of fair value measurement of liabilities [text block] Remeasurement of derivative liability ifrs-full_CurrentLiabilities Total current liabilities Share-based compensation ifrs-full_AdjustmentsForSharebasedPayments ifrs-full_EquityAndLiabilities TOTAL EQUITY AND LIABILITIES Unobservable input Entity Listings [Table] evax_SharesOutstandingPricePerShare Shares outstanding, price per share (in dollars per share) The price per share of shares outstanding. Non-current liabilities Provisions Other reserves Reclassification SBC reserve The amount reclassification for the stock based compensation reserve. Accumulated deficit Tax credit schemes accounted for as grants Amount of tax credit schemes accounted for as grants. Share capital Issued capital Unobservable inputs [axis] Statement of financial position [abstract] evax_PolicyTable EQUITY AND LIABILITIES Recurring fair value measurement [member] Borrowings by name [domain] Disclosure of finance income (cost) [text block] ifrs-full_NotesAndOtherExplanatoryInformationAbstract Notes to Financial Statements ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement2019 Warrants outstanding, weighted average exercise price (in dollars per share) Warrants granted, weighted average exercise price (in dollars per share) Warrants forfeited, weighted average exercise price (in dollars per share) Derivative liability ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019 Warrants granted, weighted average exercise price (in dollars per share) Classes of entity's own equity instruments [domain] Lease liabilities, current Level 3 of fair value hierarchy [member] Classes of share capital [domain] Classes of ordinary shares [domain] Level 2 of fair value hierarchy [member] Classes of liabilities [domain] Level 1 of fair value hierarchy [member] Exchange rate adjustments on cash and cash equivalents Current liabilities Components of equity [domain] Total Borrowings Total borrowings Counterparties [domain] ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings Less: Borrowings, current portion ifrs-full_FinanceCosts Finance expenses Total financial expenses Finance income Total financial income Total Borrowings, non-current portion Prepayments and other receivables Borrowings, current ifrs-full_IncomeTaxExpenseContinuingOperations Income tax benefit Borrowings by name [axis] Description of nature of entity's operations and principal activities [text block] The description of the nature of the entity's operations and principal activities. ifrs-full_ProfitLossAttributableToOwnersOfParent Net loss attributable to shareholders of Evaxion A/S ifrs-full_ProfitLossFromOperatingActivities Operating loss Payment of non-current financial assets – leasehold deposits Represents the amount of cash inflow (outflow) from financial assets. ifrs-full_BorrowingsInterestRate Borrowings, interest rate Profit or loss [abstract] Bottom of range [member] ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges Net (decrease)/ increase in cash and cash equivalents Warrants [member] evax_SharesIssuedAveragePricePerShare Shares issued, average price per share (in dollars per share) The average price per share for shares issued. evax_PurchaseAgreementMaximumAggregateAmount Purchase agreement, maximum aggregate amount Represents the maximum aggregate amount of stock available to be issued as part of a purchase agreement. evax_NumberOfOrdinarySharesIssuedPerAdsSold Number of ordinary shares issued per ADS sold (in shares) The number of ordinary shares issued per ADS sold. Leasehold deposits, non-current Exchange differences on translation of foreign operations Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [table] Horsholm, Denmark laboratory space [member] Relating to laboratory space in Horsholm, Denmark. Horsholm, Denmark office space [member] Relating to the office space in Horsholm, Denmark. EIB loan [member] Relating to EIB loan. ifrs-full_CashFlowsFromUsedInFinancingActivities Net cash (used in)/ provided by financing activities evax_BorrowingsTerm Borrowings, term (Year) Represents the term of borrowings. evax_LeaseArea Lease, area (Square Metre) Represents the area of a leased property. Loan from lessor [member] Relating to loan from lessor. ifrs-full_PaymentsForShareIssueCosts Transaction costs Levels of fair value hierarchy [axis] EIB loan tranche one [member] Relating to EIB loan tranche one. Payment in kind interest rate [member] Relating to payment in kind interest rate. EIB warrants [member] Relating to the EIB warrants. Document Fiscal Period Focus Document Fiscal Year Focus Entity Address, City or Town Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Country Document Period End Date Document Type Entity File Number Current Fiscal Year End Date