Document And Entity Information Debt Instrument, Name [Domain] Statistical Measurement [Axis] Note To Financial Statement Details Textual Significant Accounting Policies Note 2 - Summary of Significant Accounting Policies us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage A T M Facility [Member] Represents ATM facility. ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Accrued Liabilities ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 4 - Convertible Non-Convertible Promissory Notes Trading Arrangements, by Individual [Table] Note 5 - Stockholders' Equity Material Terms of Trading Arrangement [Text Block] Note 7 - Loss Per Share of Common Stock Note 2 - Summary of Significant Accounting Policies - Schedule of Embedded Derivative (Details) Note 2 - Summary of Significant Accounting Policies - Estimated Useful Life of Assets (Details) us-gaap_DebtInstrumentUnamortizedDiscount Unamortized discounts/deferred financing Note 3 - Accrued Liabilities - Schedule of Accrued Liabilities (Details) Note 4 - Convertible and Non-convertible Promissory Notes - Schedule of Debt (Details) Comprehensive Income, Policy [Policy Text Block] Minimum [Member] Note 5 - Stockholders' Equity - Stock-based Compensation Expense (Details) Repurchase of common stock (in shares) Treasury Stock, Shares, Acquired (in shares) Foreign exchange gains (losses) Note 5 - Stockholders' Equity - Stock-based Compensation Expense 2 (Details) Statistical Measurement [Domain] Note 5 - Stockholders' Equity - Summary of Restricted Stock Unit Activity (Details) us-gaap_DebtInstrumentPeriodicPayment Debt Instrument, Periodic Payment Maximum [Member] Note 5 - Stockholders' Equity - Schedule of Stock Option Activity (Details) Share Repurchase Program [Axis] Note 7 - Loss per Share of Common Stock - Schedule of Antidilutive Securities (Details) Schedule of Long-Term Debt Instruments [Table] Share Repurchase Program [Domain] Notes To Financial Statements Notes To Financial Statements [Abstract] Debt Instrument [Axis] CASH FLOWS FROM OPERATING ACTIVITIES: CASH FLOWS FROM INVESTING ACTIVITIES: us-gaap_NetCashProvidedByUsedInOperatingActivities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash used in operating activities CASH FLOWS FROM FINANCING ACTIVITIES: us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_PaymentsOfDebtIssuanceCosts Payments of Debt Issuance Costs us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_ForeignCurrencyTransactionGainLossUnrealized Unrealized foreign exchange gains Change in Accounting Estimate [Table] Accounting Policies [Abstract] Income taxes payable us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap_IncreaseDecreaseInIncomeTaxesReceivable Tax credit receivable Measurement Input Type [Axis] Income Statement [Abstract] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Development cost liability The amount of accrued development costs. Proceeds from promissory notes us-gaap_TreasuryStockCommonValue Treasury stock, at cost; 3,213,639 and 2,949,639 shares at June 30, 2026, and December 31, 2025, respectively Treasury stock, shares (in shares) Balance (in shares) Balance (in shares) Measurement Input, Discount Rate [Member] Treasury Stock, Common [Member] Net loss Net Income (Loss) Attributable to Parent Net loss Award Type [Axis] Reconciliation of net loss to net cash used in operating activities: Measurement Input, Price Volatility [Member] us-gaap_Liabilities Total liabilities Stock-based compensation expense us-gaap_AllocatedShareBasedCompensationExpense us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity Convertible Promissory Note [Text Block] Disclosure with information pertaining to the convertible promissory notes. allr_RoyaltyAnnualPercentage Royalty Annual Percentage The percentage of sales the company must pay as a royalty. Measurement Input Type [Domain] us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset Embedded Derivative, Fair Value of Embedded Derivative Asset us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability Embedded Derivative, Fair Value of Embedded Derivative Liability Eisai Royalties One [Member] Represents the first Eisai royalty payments. Stock-based compensation us-gaap_ShareBasedCompensation allr_EquityIssuanceMaximumAggregateSalesPrice Equity Issuance, Maximum Aggregate Sales Price Maximum amount of aggregate sales price under equity issuance. Location, Statement of Income, Balance [Axis] allr_EquityOfferingAmountAvailable Equity Offering, Amount Available The amount of shares available to be issued in the equity offering. Changes in operating assets and liabilities: Accounts payable us-gaap_IncreaseDecreaseInAccountsPayable Accounting Standards Update and Change in Accounting Principle [Table] License And Development Agreements [Text Block] The disclosure of the licensing and development agreements. Accrued expenses and other liabilities Restricted cash Restricted Cash, Current us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash, cash equivalents, and restricted cash us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue Balance Balance us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Effect of exchange rate changes on cash and cash equivalents us-gaap_TreasuryStockValueAcquiredCostMethod Treasury Stock, Value, Acquired, Cost Method Repurchase of common stock New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Total cash and cash equivalents and restricted cash as presented in the condensed consolidated balance sheet Cash, cash equivalents, and restricted cash, beginning of period Cash, cash equivalents, and restricted cash, end of period Concentration Risk, Credit Risk, Policy [Policy Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Antidilutive Securities, Name [Domain] Statement [Table] allr_IssuanceOfStockAndWarrantsForServicesOrClaims1 Common stock issued for services Represent the fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims. Prepaid expenses Risks and Uncertainties [Policy Text Block] Disclosure of accounting policy for information about unusual risk or uncertainty or both and their financial impact or potential financial impact. Statement of Financial Position [Abstract] us-gaap_NonoperatingIncomeExpense Total other income (expense), net Equipment [Member] Non-current assets: Tax credit receivable us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Unvested balance, units (in shares) Unvested balance, units (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Unvested balance, fair value (in dollars per share) Unvested balance, fair value (in dollars per share) srt_StockRepurchaseProgramAuthorizedAmount1 Share Repurchase Program, Authorized, Amount Grants, units (in shares) Grants, fair value (in dollars per share) Issuance of common stock for service allr_BeneficialOwnershipLimitation Beneficial Ownership Limitation The maximum amount of a security, expressed a percentage of total shares outstanding, that any one entity may own. Issuance of common stock for service (in shares) Product and Service [Domain] Product and Service [Axis] allr_PolicyTable Estimated useful life (Year) us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount us-gaap_PaymentsForRepurchaseOfCommonStock Common stock repurchase Warrant [Member] Document Type Operating expenses: Document Information [Line Items] Document Quarterly Report Document Information [Table] us-gaap_IncreaseDecreaseInOtherCurrentAssets Other current assets us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) us-gaap_ProceedsFromIssuanceOfDebt Proceeds from Issuance of Debt us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) Antidilutive securities (in shares) Antidilutive Securities [Axis] Entity Interactive Data Current us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Outstanding, shares (in shares) Outstanding, shares (in shares) Commitments and Contingencies Disclosure [Text Block] Document Transition Report us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average exercise price (in dollars per share) Outstanding, weighted average exercise price (in dollars per share) Statement [Line Items] Liability Class [Axis] us-gaap_OperatingExpenses Total operating expenses Outstanding, intrinsic value Common stock, issued (in shares) Common stock, outstanding (in shares) Award Type [Domain] Common stock, authorized (in shares) us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 Share Repurchase Program, Remaining Authorized, Amount Weighted average common shares outstanding, basic and diluted (in shares) us-gaap_DebtInstrumentTerm Debt Instrument, Term (Month) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] Net loss per common share, basic and diluted (in dollars per share) Net proceeds from sale of common stock and pre-funded warrant issuance The cash inflow from issuance of common stock and warrants. Antidilutive Security, Excluded EPS Calculation [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] allr_SharebasedCompensationArrangementBySharebasedPaymentAwardAnnualPercentageIncrease Share-Based Compensation Arrangement by Share-Based Payment Award, Annual Percentage Increase Represents the annual percentage increase of shares related to the share-based compensation. Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Common stock, $0.0001 par value: 250,000,000 shares authorized; 19,124,363 and 19,030,619 shares issued and 15,910,724 and 16,080,980 outstanding at June 30, 2026 and December 31, 2025, respectively us-gaap_ProceedsFromIssuanceOrSaleOfEquity Proceeds from Issuance or Sale of Equity Proceeds from ATM sales of common stock, net of issuance costs Proceeds from Issuance of Common Stock Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Stock-based compensation The additional paid in capital related to the share based arrangement, increase for the cost recognition or recovery. Accounts payable Accounts Payable, Current us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables allr_CommissionFeePercentage Commission Fee, Percentage Represents the commission fee percentage. Document Fiscal Period Focus Document Fiscal Year Focus us-gaap_ComprehensiveIncomeNetOfTax Total comprehensive loss Amendment Flag Common Stock [Member] Payroll accruals Accrued audit and legal Promissory note, net of discounts and accrued interest Total outstanding debt Subsequent Events [Text Block] Accrued expenses and other current liabilities Accrued Liabilities, Current Total accrued expenses and other current liabilities Document Period End Date Long-Lived Asset, Class [Domain] Legal Entity [Axis] Property, Plant, and Equipment, Estimated Useful Life [Table Text Block] Tabular disclosure for the estimated useful life of property, plant, and equipment. Significant Accounting Policies [Text Block] Change in fair value of warrant and derivative liabilities Change in fair value of derivative and warrant liabilities Amount of expense (income) related to adjustment to fair value of warrant and derivative liabilities. Entity File Number Milestone Liabilities [Member] Relating to milestone liabilities. Outstanding, weighted average contractual term (Year) Entity Tax Identification Number Other Entity [Domain] Entity Central Index Key Entity Registrant Name Accrued interest Change in cumulative translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Income taxes payable Entity Ex Transition Period Fair Value Measurement, Policy [Policy Text Block] Research and development Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax Currency translation adjustment us-gaap_OperatingIncomeLoss Loss from operations Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Offsetting Assets [Table] Change in fair value of net derivative liability Revenue: us-gaap_InterestExpenseDebt Interest Expense, Debt Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Entity Address, City or Town Derivative liability us-gaap_InterestExpenseNonoperating Interest expense Accumulated deficit Retained Earnings (Accumulated Deficit) Entity Address, Address Line One Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Statement of Cash Flows [Abstract] City Area Code Local Phone Number Entity Address, Postal Zip Code Convertible promissory notes and accrued interest Convertible Notes Payable, Current Depreciation and amortization The aggregate expense (income) recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Title of 12(b) Security Equity Components [Axis] Security Exchange Name Trading Symbol Derivatives, Policy [Policy Text Block] Class of Stock [Axis] Equity Component [Domain] Equity [Text Block] AOCI Attributable to Parent [Member] Entity Common Stock, Shares Outstanding Additional Paid-in Capital [Member] Retained Earnings [Member] Earnings Per Share [Text Block] Other current assets Foreign Currency Transactions and Translations Policy [Policy Text Block] Property, plant and equipment, net us-gaap_EmbeddedDerivativeLiabilityMeasurementInput Embedded Derivative Liability, Measurement Input us-gaap_EmbeddedDerivativeAssetLiabilityNetMeasurementInput Embedded Derivative Asset (Liability) Net, Measurement Input Streeterville Note [Member] Streeterville Note allr_DebtInstrumentMonitoringFeeExpense Debt Instrument, Monitoring Fee, Expense The expense recognized during the period for a debt instrument monitoring fee. Subsequent Event [Table] allr_DebtInstrumentCovenantMonitoringFeeDivisor Debt Instrument, Covenant, Monitoring Fee, Divisor The value used as a divisor to calculate the monitoring fee for debt instrument. Property, Plant, and Equipment [Policy Text Block] Principal balance and fees Amount, before unamortized (discount) premium and debt issuance costs, of short-term debt. Sale of Stock [Axis] Exercised/Forfeited, shares (in shares) Number of share options (or share units) exercised or forfeited during the current period. Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Original issue discount (OID) Debt Instrument, Original Issue Discount Amount, after accumulated amortization, of original issue debt discount. Unamortized OID Amount of unamortized original issue debt discount. Stockholders’ equity Other income (expense): Exercised/Forfeited, intrinsic value Amount of accumulated difference between fair value of underlying shares on dates of exercise/forfeiture and exercise price on options exercised/forfeited (or share units converted) into shares. Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Exercised/Forfeited, weighted average exercise price (in dollars per share) Weighted average price of options that were either forfeited or exercised. Long-Lived Asset, Class [Axis] Sale of Stock [Domain] Share-Based Payment Arrangement, Option, Activity [Table Text Block] Embedded Derivative Financial Instruments [Member] us-gaap_Assets Total assets Cash and Cash Equivalents, Policy [Policy Text Block] us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax OCI, Foreign Currency Transaction and Translation Gain (Loss), Arising During Period, Tax Cash and cash equivalents Accounts Payable and Accrued Liabilities Disclosure [Text Block] Share-Based Payment Arrangement, Option [Member] Supplemental information Current liabilities Non-cash interest expense us-gaap_LiabilitiesCurrent Total current liabilities Consolidation, Policy [Policy Text Block] Fair Value by Liability Class [Domain] License [Member] Interest income Streeterville A-1 Note [Member] Represents the Streeterville A-1 Note. Other Commitments [Table] Accumulated other comprehensive loss General and administrative allr_EquityOfferingPurchasePricePercentageOfVwap Equity Offering, Purchase Price, Percentage of VWAP The purchase price per share in an equity offering expressed as a percentage of VWAP. Financial Instrument Subject to Mandatory Redemption [Table] Tunim Purchase Agreement [Member] Represents the Tunim Stone Capital Common Stock Purchase Agreement. Streeterville B Note [Member] Represents Streeterville B Note. Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Additional paid-in capital us-gaap_StockholdersEquity Total stockholders’ equity Balance Balance Use of Estimates, Policy [Policy Text Block] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property and equipment Sale of common shares, net Stock, Class of Stock [Table] Furniture and Office Equipment [Member] Represents furniture and office equipment. Nature of Operation, Product Information, Concentration of Risk [Table] us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Current assets Schedule of Debt [Table Text Block] us-gaap_AssetsCurrent Total current assets ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Revenue Repurchase Program 2025 [Member] Repurchase Program 2025 Repurchase Program 2026 [Member] Repurchase Program 2026 us-gaap_DebtInstrumentFeeAmount Debt Instrument, Fee Amount Sale of common shares, net (in shares) Stock Issued During Period, Shares, New Issues (in shares) Commitments and contingencies (Note 8) Restricted Stock Units (RSUs) [Member]