Document And Entity Information
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Statistical Measurement [Axis]
Note To Financial Statement Details Textual
Significant Accounting Policies
eton_OperatingLeaseImprovementAllowance
Operating Lease, Improvement Allowance
The improvement allowance related to the operating lease.
Note 2 - Summary of Significant Accounting Policies
Income tax expense
Income tax expense
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Note 3 - Long-term Debt
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Note 4 - Property and Equipment
Trading Arrangements, by Individual [Table]
Note 5 - Inventory
Material Terms of Trading Arrangement [Text Block]
Note 7 - Share-based Payment Awards
Note 8 - Basic and Diluted Net Loss Per Common Share
Note 9 - Income Taxes
Note 11 - Leases
Note 2 - Summary of Significant Accounting Policies - Schedule of Intangible Assets (Details)
Minimum [Member]
Note 2 - Summary of Significant Accounting Policies - Schedule of Intangible Assets Amortization Expense (Details)
Note 3 - Long-term Debt - Schedule of Future Payments (Details)
Statistical Measurement [Domain]
Note 4 - Property and Equipment - Schedule of Property and Equipment (Details)
Maximum [Member]
Note 5 - Inventory - Schedule of Inventory (Details)
Weighted average grant date fair value (in dollars per share)
Lukare [Member]
Represents Lukare Medical LLC.
Note 7 - Share-Based Payment Awards - Schedule of Stock Option Activity (Details)
Obligation Based on No Generic Competitors Launching in 48 Months [Member]
Represents an Obligation Based on No Generic Competitors Launching in 48 Months.
Note 7 - Share-Based Payment Awards - Schedule of Assumptions Used to Calculate Fair Value of Options Granted (Details)
Note 7 - Share-Based Payment Awards -Schedule of Restricted Stock Unit Activity (Details)
eton_PaymentsToAcquireMarketingRightsAcquisitionCosts
Payments to Acquire Marketing Rights, Acquisition Costs
The cash outflow from amounts paid for costs of acquiring marketing rights.
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Note 8 - Basic and Diluted Net Loss per Common Share - Schedule of Earnings (Details)
Note 9 - Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Details)
Note 11 - Leases - Schedule of Lease-related Assets and Liabilities (Details)
Note 11 - Leases - Schedule of Lease-related Assets and Liabilities (Details) (Parentheticals)
Note 11 - Leases - Schedule of Future Lease Payments (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Counterparty Name [Axis]
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective tax rate
Issued, Weighted Average Exercise Price (in dollars per share)
Exercised, Weighted Average Exercise Price (in dollars per share)
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)
eton_BusinessCombinationContingentConsiderationLiabilityAccretedToInterestExpense
Business Combination, Contingent Consideration, Liability, Accreted to Interest Expense
The amount of liabilities accredited to interest expense.
Interest and other expense, net
Leasehold improvements
Counterparty Name [Domain]
us-gaap_IncreaseDecreaseInInventories
Inventories
us-gaap_SharesOutstanding
Balances (in shares)
Balances (in shares)
Award Type [Axis]
Adjustments to reconcile net income (loss) to net cash from operating activities:
Plan Name [Axis]
us-gaap_Liabilities
Total liabilities
Plan Name [Domain]
us-gaap_AllocatedShareBasedCompensationExpense
Share-Based Payment Arrangement, Expense
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders’ equity
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
Stock-based compensation
us-gaap_ShareBasedCompensation
Subsequent Event [Member]
Lessee, Lease, Description [Table]
Share-Based Payment Arrangement [Text Block]
Location, Statement of Income, Balance [Axis]
Changes in operating assets and liabilities:
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
Useful life (Year)
Intangible Asset, Finite-Lived, Useful Life (Year)
eton_AggregateValueOfLicensingMilestoneIncludedInResearchAndDevelopmentExpense
Aggregate Value of Licensing Milestone Included in Research and Development Expense
Aggregate value of licensing milestone amount included in research and development expense.
us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued liabilities
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Change in cash and cash equivalents
us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Business Combination, Contingent Consideration, Liability, Current
us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Business Combination, Contingent Consideration, Liability, Noncurrent
New Accounting Pronouncements, Policy [Policy Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Statement [Table]
us-gaap_OperatingLeasePayments
Operating Lease, Payments
GALZIN [Member]
In relation to GALZIN.
Equipment
NDA Approval by the FDA and First Commercial Sale [Member]
Represents the NDA approval by the FDA and first commercial sale.
Receipt of FDA Minutes [Member]
Represents receipt of FDA minutes.
us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
NDA Acceptance for Review by FDA [Member]
Represents NDA acceptance for review by FDA.
In Process Research and Development [Member]
Amglidia [Member]
Represents Amglidia.
AMMTeK [Member]
Represents AMMTeK.
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
eton_PolicyTable
Line of Credit Facility, Lender [Domain]
us-gaap_EquityMethodInvestmentOwnershipPercentage
Equity Method Investment, Ownership Percentage
eton_PaymentsToAcquireInventory
Payments to Acquire Inventory
Amount of cash outflow to acquire inventory.
Liability, Interest and Exit Fees [Member]
Liability recognized interest and exit fees.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Outstanding and unvested, balance (in shares)
Lender Name [Axis]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Outstanding and unvested, Weighted Average Grant-Date Fair Value Per Unit (in dollars per share)
Outstanding and unvested, Weighted Average Grant-Date Fair Value Per Unit (in dollars per share)
Granted (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Granted, Weighted Average Grant-Date Fair Value Per Unit (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited (in shares)
Product and Service [Domain]
Product and Service [Axis]
Ownership [Axis]
Ownership [Domain]
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life (Year)
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2026
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Vested, Weighted Average Grant-Date Fair Value Per Unit (in dollars per share)
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested (in shares)
Total
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating Lease, Weighted Average Discount Rate, Percent
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2027
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)
Schedule of Maturities of Long-Term Debt [Table Text Block]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
2026 (Remainder)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Exercisable, Options (in shares)
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Exercisable, Weighted Average Exercise Price (in dollars per share)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2029
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Balance, Options (in shares)
Balance, Options (in shares)
Commitments and Contingencies Disclosure [Text Block]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2028
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_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2030
Outstanding, Aggregate Intrinsic Value
Common stock, issued (in shares)
Common stock, outstanding (in shares)
Common Stock, Shares, Outstanding (in shares)
Award Type [Domain]
Common stock, authorized (in shares)
Common Stock, Shares Authorized (in shares)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Expected volatility
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Common stock, $0.001 par value; 50,000,000 shares authorized; 28,289,941 and 27,047,061 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively
2028, amortization
2029, amortization
Schedule of Inventory, Current [Table Text Block]
2027, amortization
Accounts payable
us-gaap_FinanceLeaseLiability
Finance Lease, Liability
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Accrued Medicaid rebates
The amount of accrued medicaid rebates classified as current.
Remainder of 2026, amortization
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
eton_IncreaseDecreaseInAccruedMedicaidRebates
Accrued Medicaid rebates
The amount of increase (decrease) in accrued Medicaid rebates.
2030, amortization
us-gaap_TableTextBlock
Notes Tables
Computer Equipment [Member]
Subsequent Events [Text Block]
Concentration Risk Type [Axis]
Accrued Liabilities, Current
Accrued Liabilities, Current
us-gaap_EmployeeRelatedLiabilitiesCurrent
Employee-related Liabilities, Current
Betaine Anhydrous Product Rights [Member]
Relating to Betaine Anhydrous product rights.
Significant Accounting Policies [Text Block]
Carglumic Acid Product Rights [Member]
Relating to Carglumic acid product rights.
Non-cash lease expense
Operating Lease, Right-of-Use Asset, Periodic Reduction
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less: Imputed interest
Operating lease liabilities, noncurrent
Operating lease liabilities, net of current portion
Outstanding, Weighted Average Remaining Contractual Term (Year)
Total lease liabilities
Operating Lease, Liability
Total operating lease liabilities
Operating lease liabilities, current
Unaudited Interim Financial Information [Policy Text Block]
Disclosure of the company's policy for unaudited interim financial information.
Accounts Receivable [Member]
Expected term (in years) (Year)
Exercisable, Weighted Average Remaining Contractual Term (Year)
Concentration Risk Type [Domain]
us-gaap_LongTermDebtNoncurrent
Long-term debt, net of current portion and debt discount and accrued exit fees
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2027
us-gaap_LongTermDebt
Debt, net
Intangible Asset, Finite-Lived, Class [Axis]
Statement of Stockholders' Equity [Abstract]
Selenix Agreement [Member]
Represents the Selenix Agreement.
Intangible Asset, Finite-Lived, Class [Domain]
Class of Warrant or Right [Axis]
Class of Warrant or Right [Domain]
Statement of Cash Flows [Abstract]
eton_NumberOfQuarterlyInstallmentPayments
Number of Quarterly Installment Payments
The number of quarterly installment payments that the company is required to make.
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Stockholders’ equity
Equity Components [Axis]
Share-Based Payment Arrangement [Policy Text Block]
Proceeds from stock option exercises
Equity Component [Domain]
Equity [Text Block]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Selenix [Member]
In relation to the company Selenix.
IMPAVIDO [Member]
Represents IMPAVIDO.
DS-200 [Member]
In relation to DS-200.
Product sales and royalties, net
Cost of Product and Service Sold
Exercise of warrants, net of shares withheld (in shares)
Stock Issued During Period, Shares, Warrant Exercises Net of Shares Withheld (in shares)
Stock issued for warrant exercises net of shares withheld.
Asset Acquisition [Domain]
Exercise of warrants, net of shares withheld
The amount of stock issued during period for warrant exercises net of shares withheld.
Asset Acquisition [Axis]
Excess and obsolete inventory reserve
Property and equipment, net
Property and equipment, net
Property and equipment, gross
Runway Growth Finance, Common Stock Warrants at an Exercise Price of $5.86 [Member]
The Runway Growth Finance common stock warrants at an exercise price of $5.86.
Subsequent Event Type [Domain]
Runway Growth Finance, Common Stock Warrants at an Exercise Price of $6.62 [Member]
Represents Runway Growth Finance common stock warrants at an exercise price of $6.62.
eton_ClassOfWarrantOrRightExercisedDuringPeriodExercisePrice
Class of Warrant or Right, Exercised During Period, Exercise Price (in dollars per share)
Exercise price per share of warrants or rights exercised during period.
Increlex [Member]
In reference to the product Increlex.
Subsequent Event [Table]
Subsequent Event Type [Axis]
Property, Plant, and Equipment [Policy Text Block]
Plus: accrued exit fees at June 30, 2026
Represents the amount of accrued exit fees on a debt instrument.
Cost of sales:
Cost of Goods and Service [Policy Text Block]
Runway Growth Finance Warrants [Member]
The Runway Growth Finance Warrants.
Runway Growth Finance, Common Stock Warrants at an Exercise Price of $5.32 [Member]
Represents Runway Growth Finance common stock warrants at an exercise price of $5.32.
eton_ClassOfWarrantOrRightWeightedAverageFairMarketValue
Class of Warrant or Right, Weighted Average Fair Market Value (in dollars per share)
The weighted average fair market value of warrants.
eton_ProceedsFromUpfrontPayment
Proceeds From Up-front Payment
In relation to proceeds from payments received upfront.
Furniture and Fixtures [Member]
Stock-based compensation
us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Messa Holdings LLC [Member]
In relation to Messa Holdings LLC
Furniture and fixtures
Sean E. Brynjelsen [Member]
In reference to Sean E. Brynjelsen.
eton_LicensingAgreementNumberOfAdditionalAnnualRenewals
Licensing Agreement, Number of Additional Annual Renewals
Represents number of additional annual renewals under licensing agreement.
eton_LicensingAgreementNetSalesMilestoneOne
Licensing Agreement, Net Sales Milestone, One
Amount of net sales milestone one under licensing agreement.
eton_LicensingAgreementNetSalesMilestoneTwo
Licensing Agreement, Net Sales Milestone, Two
Amount of net sales milestone two under licensing agreement.
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
eton_LicensingAgreementAdditionalPaymentUponReachingMilestonesTrancheFour
Licensing Agreement, Additional Payment Upon Reaching Milestones, Tranche Four
Additional amount of payment upon reaching sales milestones tranche four under licensing agreement.
eton_LicensingAgreementAdditionalPaymentUponReachingMilestonesTrancheTwo
Licensing Agreement, Additional Payment Upon Reaching Milestones, Tranche Two
Additional amount payment upon reaching sales milestones tranche two under licensing agreement.
eton_LicensingAgreementAdditionalPaymentUponReachingMilestonesTrancheThree
Licensing Agreement, Additional Payment Upon Reaching Milestones, Tranche Three
Additional amount of payment upon reaching sales milestones tranche three under licensing agreement.
eton_LicensingAgreementAdditionalPaymentUponReachingMilestones
Licensing Agreement, Additional Payment Upon Reaching Milestones
Amount of additional payment payable upon reaching sale milestones under licensing agreement.
eton_LicensingAgreementAdditionalPaymentUponReachingMilestonesTrancheOne
Licensing Agreement, Additional Payment Upon Reaching Milestones, Tranche One
Additional amount of payment upon reaching sales milestones tranche one under licensing agreement.
eton_LicensingAgreementAnnualPaymentPercentageOfNetSalesTwo
Licensing Agreement, Annual Payment Percentage of Net Sales, Two
Percentage of net sales for annual payments under licensing agreement.
eton_OtherCommitmentCurrent
Other Commitment, Current
Current portion of minimum amount of other commitment not otherwise specified in the taxonomy.
eton_LicensingAgreementAnnualPaymentPercentageOfNetSalesOne
Licensing Agreement, Annual Payment Percentage of Net Sales, One
Amount of annual payment as percentage of net sales one.
eton_LicensingAgreementAnnualPaymentNetSalesBenchmark
Licensing Agreement, Annual Payment, Net Sales Benchmark
Amount of net sales benchmark for annual payment under licensing agreement.
Share-Based Payment Arrangement, Option [Member]
eton_LicensingAgreementNetSalesMilestoneThree
Licensing Agreement, Net Sales Milestone, Three
Amount of net sales milestone three under licensing agreement.
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
eton_LicensingAgreementNetSalesMilestoneFour
Licensing Agreement, Net Sales Milestone, Four
Amount of net sales milestone four under licensing agreement.
Supplemental disclosures of cash flow information
us-gaap_AccountsReceivableNet
Accounts Receivable, after Allowance for Credit Loss
Licensing Agreement Assets Acquisition [Member]
Represents Licensing Agreement Assets Acquisition.
Liabilities, Current [Abstract]
eton_OtherCommitmentNoncurrent
Other Commitment, Noncurrent
Noncurrent portion of minimum amount of other commitment not otherwise specified in the taxonomy.
us-gaap_LiabilitiesCurrent
Total current liabilities
Knight Therapeutics [Member]
Represents Knight Therapeutics.
Licensing Agreement [Member]
Represents licensing agreement.
us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]
Secured Overnight Financing Rate (SOFR) [Member]
Accounts receivable, net
Customer Concentration Risk [Member]
us-gaap_IncomeTaxesPaid
Income Tax Paid, before Refund Received
us-gaap_PaymentsToAcquireIntangibleAssets
Payments to Acquire Intangible Assets
Purchases of product license rights
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Forfeited/Cancelled, Options (in shares)
Revenue Benchmark [Member]
Lessee, Leases [Policy Text Block]
Long-Term Debt [Text Block]
Other Commitments [Table]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less: accumulated depreciation and amortization
eton_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
2031 and thereafter
Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
Intangible asset, accumulated amortization
Forfeited/Cancelled, Weighted Average Exercise Price (in dollars per share)
Other Commitments [Axis]
Short-term debt, net of debt discount
Other Commitments [Domain]
General and administrative
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (loss) before income tax expense
Income (loss) before income taxes
Lessee, Operating Lease, Disclosure [Table Text Block]
Tabular disclosure for operating lease.
Additional paid-in capital
Segment Reporting, Policy [Policy Text Block]
Use of Estimates, Policy [Policy Text Block]
Prepaid expenses and other current assets
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)
Shares issued under employee stock purchase plan (ESPP)
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
Lessee, Operating Leases [Text Block]
us-gaap_MinorityInterestOwnershipPercentageByParent
Subsidiary, Ownership Percentage, Parent
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Current assets:
Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]
us-gaap_AssetsCurrent
Total current assets
Shares issued under employee stock purchase plan (ESPP) (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)
us-gaap_GrossProfit
Gross profit
Restricted Stock Units (RSUs) [Member]
Debt Instrument, Name [Domain]
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)
Exercised, Options (in shares)
us-gaap_Depreciation
Depreciation
Related and Nonrelated Parties [Axis]
us-gaap_DebtInstrumentUnamortizedDiscount
Less: unamortized discount
us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Debt Instrument, Periodic Payment, Principal
Schedule of Long-Term Debt Instruments [Table]
Debt Instrument [Axis]
Cash flows from operating activities
Cash flows used in investing activities
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash from operating activities
Cash flows from financing activities
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash from financing activities
Repayment of long-term debt
us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Impairment, Long-Lived Asset, Held-for-Use
Accounting Policies [Abstract]
Long-Lived Asset, Excluding Intangible Asset and Goodwill, Impairment and Disposal [Policy Text Block]
Accounts Receivable [Policy Text Block]
PKU GoLike [Member]
Represents information pertaining to PKU GoLike.
Stock option exercises and vesting of restricted stock
Value of stock issued as a result of the exercise of stock options and the aggregate value of stock related to Restricted Stock Awards issued during the period.
Stock option exercises and vesting of restricted stock (in shares)
Number of share options (or share units) exercised during the current period and total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.
Income Statement [Abstract]
Thereafter, amortization
Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
SWK Credit Agreement [Member]
Represents the SWK Credit Agreement.
Net income (loss)
Net income (loss)
Net income (loss)
us-gaap_AmortizationOfIntangibleAssets
Intangible Asset, Finite-Lived, Amortization Expense
us-gaap_OtherCommitment
Other Commitment
eton_SharebasedCompensationArrangementBySharebasedPaymentAwardAnnualIncreaseInShareReserveAsAPercentOfOutstandingCommonStock
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Share Reserve as a Percent of Outstanding Common Stock
Represents the annual increase in share reserve as a percentage of outstanding common stock.
The 2018 Plan [Member]
Represents information on the 2018 Equity Incentive Plan (the 2018 Plan).
Glazin [Member]
Relating to Glazin.
Income Tax Disclosure [Text Block]
us-gaap_BusinessCombinationContingentConsiderationLiability
Business Combination, Contingent Consideration, Liability
Proceeds from shares issued under the ESPP
Accounting Standards Update and Change in Accounting Principle [Table]
Income Tax, Policy [Policy Text Block]
Nitisinone Product Rights [Member]
The Nitisinone product rights.
Related and Nonrelated Parties [Domain]
Related Party Transaction [Table]
Related Party Transactions Disclosure [Text Block]
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Hemangeol [Member]
Relating to Hemangeol.
Pierre Fabre [Member]
Relating to Pierre Fabre.
SWK Holdings Corporation [Member]
Information by name of lender.
Other expense:
Statement of Financial Position [Abstract]
The Amended Agreement [Member]
Information pertaining to the amended agreement.
us-gaap_ProceedsFromIncomeTaxRefunds
Proceeds from Income Tax Refunds
Cash paid for income taxes
eton_DebtInstrumentExitFeePercentage
Debt Instrument, Exit Fee as a Percentage of Outstanding Amounts
Represents the exit fee as a percentage of outstanding amounst.
eton_LongTermDebtIncludingInterestGross
Total payments
The amount of the long-term debt, including interest.
eton_CommonStockCapitalSharesReservedForFutureIssuancePercentageIncrease
Common Stock, Capital Shares Reserved for Future Issuance, Percentage Increase
Information on the automatic increase in reserve as a percentage of the outstanding common shares.
eton_CommonStockCapitalSharesReservedForFutureIssuanceIncrease
Common Stock, Capital Shares Reserved for Future Issuance, Increase (in shares)
Information on the automatic increase in reserve of common shares.
The 2018 Employee Stock Purchase Plan [Member]
Information on the 2018 Employee Stock Purchase Plan.
Other long-term assets, net
us-gaap_WarrantsAndRightsOutstanding
Warrants and Rights Outstanding
Document Type
eton_EmployeeStockPurchasePlansFairValueOfCommonStockPricePerShareOnPurchaseDatePercentage
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Purchase Date, Percentage
Information on using payroll deductions to purchase common shares.
Operating expenses:
Document Information [Line Items]
Document Quarterly Report
us-gaap_ConcentrationRiskPercentage1
Concentration Risk, Percentage
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating Lease, Weighted Average Remaining Lease Term (Year)
Document Information [Table]
eton_EmployeeStockPurchasePlansFairValueOfCommonStockPricePerShareOnOfferingDatePercentage
Employee Stock Purchase Plans, Fair Value of Common Stock Price Per Share on Offering Date, Percentage
Information on using payroll deductions to purchase common shares.
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)
Entity Interactive Data Current
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
eton_RevenueAdditionalBasedOnEventAndSalesbasedMilestonesAchievements
Revenue, Additional Based on Event and Sales-based Milestones Achievements
Information on additional revenue based on event-based and sales-based milestones achievements.
Document Transition Report
Weighted average number of common shares outstanding, diluted (in shares)
Weighted average common shares outstanding, diluted (in shares)
us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Other non-current assets and liabilities
us-gaap_OperatingExpenses
Total operating expenses
The Two Thousand Eighteen Equity Incentive Plan Member
Represents the Two Thousand Eighteen Equity Incentive Plan.
eton_CommitmentAllocationOfProfitsPercentage
Commitment, Allocation of Profits, Percentage
Information on the allocation of profits as a percentage.
AnovoRx [Member]
Represents AnovoRx.
Weighted average number of common shares outstanding, basic (in shares)
Weighted average common shares outstanding, basic (in shares)
Antidilutive Security, Excluded EPS Calculation [Table]
Net income (loss) per share, basic (in dollars per share)
Net income (loss) per share, basic (in dollars per share)
Research and Development Expense, Policy [Policy Text Block]
Effective Income Tax Rate Reconciliation [Table]
Earnings Per Share, Policy [Policy Text Block]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Intangible assets, net
Debt discount amortization and non-cash interest expenses
Amortization of Debt Discount (Premium)
Diurnal Limited [Member]
Information by name of counterparty.
Intangible assets, net
us-gaap_FiniteLivedIntangibleAssetsNet
Intangible Asset, Finite-Lived, after Accumulated Amortization
Total estimated amortization expense
Exclusive Licensing and Supply Agreement (the “Alkindi License Agreement”) [Member]
Information on the Exclusive Licensing and Supply Agreement (the “Alkindi License Agreement”).
Document Fiscal Period Focus
Finite lived intangible, gross
Document Fiscal Year Focus
Investment, Name [Domain]
Depreciation and amortization
Amendment Flag
Common Stock [Member]
eton_PaymentsToAcquireMarketingRights
Payments to Acquire Marketing Rights
The cash outflow from amounts paid for marketing rights.
Document Period End Date
Property, Plant, and Equipment [Text Block]
Long-Lived Asset, Class [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Issued, Options (in shares)
Legal Entity [Axis]
Tulex Pharmaceuticals, Inc. (“Tulex”) [Member]
Information by name of counterparty.
us-gaap_OperatingLeaseCost
Operating Lease, Cost
Indemnification Rights and Agreements [Member]
Information on the type of commitment.
Business Combination [Domain]
Entity File Number
Entity Tax Identification Number
Business Combination [Axis]
Entity [Domain]
Entity Central Index Key
Entity Registrant Name
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
Risk-free interest rate, maximum
Business Combination [Policy Text Block]
Entity Current Reporting Status
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
Risk-free interest rate, minimum
Entity Incorporation, State or Country Code
Current Fiscal Year End Date
Fair Value Measurement, Policy [Policy Text Block]
Research and development
Entity Filer Category
Entity Shell Company
eton_OtherCommitmentAccretedToInterestExpense
Other Commitment, Accreted to Interest Expense
The amount of other commitments accreted to interest.
Entity Emerging Growth Company
Entity Small Business
us-gaap_OperatingIncomeLoss
Income (loss) from operations
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
us-gaap_InterestExpense
Interest Expense, Operating and Nonoperating
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
us-gaap_Revenues
Revenues
Revenues:
Entity Address, State or Province
Entity Address, City or Town
Inventory, Current [Table]
Accumulated deficit
Entity Address, Address Line One
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
City Area Code
Local Phone Number
Entity Address, Postal Zip Code
Title of 12(b) Security
License Agreement for Late-stage Rare Disease Product Candidate ASN-001 [Member]
Represents license agreement for a late-stage rare disease product candidate ASN-001.
Security Exchange Name
Trading Symbol
Obligation Based on Acceptance of FDA of NDA for product [Member]
Represents obligation based on acceptance of FDA of NDA for product.
eton_RoyaltiesPercentageOfNetSales
Royalties, Percentage of Net Sales,
Represents percentage of net sales related to royalties.
Obligation Based on First Commercial Sale of Product [Member]
Represents obligation based on first commercial sale of product.
Class of Stock [Axis]
Sales Milestone One [Member]
Represents first sales milestone.
eton_AgreementMilestonePaymentMinimumProductSales
Agreement, Milestone Payment, Minimum Product Sales
The minimum product sales for milestone payment under agreement.
Variable Rate [Domain]
First Commercial Sale After FDA Approval [Member]
Represents first commercial sale after FDA approval.
Revenue [Policy Text Block]
Related Party Transaction [Domain]
eton_AgreementUpfrontLicenseFeePeriod
Agreement, Upfront License Fee Period (Day)
Period for the upfront license fee to be paid under agreement.
eton_AgreementMilestonePayment
Agreement, Milestone Payment
Amount of milestone payment under agreement.
Entity Common Stock, Shares Outstanding
Auson Pharmaceuticals [Member]
Represents Auson Pharmaceuticals.
Related Party Transaction [Axis]
eton_AgreementUpfrontLicenseFee
Agreement, Upfront License Fee
Amount of upfront license fee for agreement.
Earnings Per Share [Text Block]
eton_AgreementRoyaltyRate
Agreement, Royalty Rate
Percentage of royalty rate under agreement.
Chief Executive Officer [Member]
eton_AgreementRoyaltyRateNetProductSales
Agreement, Royalty Rate, Net Product Sales
Amount of net product sales for royalty rate under agreement.
Sales Milestone Four [Member]
Represents sales milestone four.
Sales Milestone Five [Member]
Represents sales milestone five.
Sales Milestone Two [Member]
Represents sales milestone two.
Sales Milestone Three [Member]
Represents sales milestone three.
us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid
Computer hardware and software
Scenario [Axis]
Scenario [Domain]
Forecast [Member]
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Options exercisable as of June 30, 2026
Property, Plant, and Equipment [Table]
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
Investment, Name [Axis]
Basis of Accounting, Policy [Policy Text Block]
Long-Lived Asset, Class [Axis]
Receivable [Domain]
us-gaap_Assets
Total assets
Cash and Cash Equivalents, Policy [Policy Text Block]
eton_PercentageForValuationReserveAgainstDeferredTaxAssets
Percentage for Valuation Reserve Against Deferred Tax Assets
Percentage for Valuation Reserve Against Deferred Tax Assets.
Cash and cash equivalents
Inventory step-up
Inventory Step-Up
Represents the amount of increase in inventory as a result of a step up in value.
us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Common Stock, Capital Shares Reserved for Future Issuance (in shares)
Net income (loss) per share, diluted (in dollars per share)
Net income (loss) per share, diluted (in dollars per share)
eton_ClassOfWarrantOrRightExercisedDuringPeriod
Class of Warrant or Right, Exercised During Period (in shares)
The number of warrants or rights exercised during period.
us-gaap_ContractWithCustomerLiabilityNoncurrent
Contract with Customer, Liability, Noncurrent
us-gaap_ContractWithCustomerLiability
Contract with Customer, Liability
us-gaap_ContractWithCustomerLiabilityCurrent
Contract with Customer, Liability, Current
Patent Costs [Policy Text Block]
Patent costs policy text block.
Debt, Policy [Policy Text Block]
Fair Value by Liability Class [Domain]
License [Member]
Receivable Type [Axis]
Cash paid for interest
Inventory Disclosure [Text Block]
Finished goods
Intangible Asset, Finite-Lived [Table Text Block]
Intangible Asset, Finite-Lived [Table]
Product [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Outstanding and unvested, balance (in shares)
Inventories, net
Inventory, net
eton_LicenseAgreementPurchasePriceOfOptionToAcquire
License Agreement, Purchase Price of Option to Acquire
Represents the purchase price to acquire licensing rights in a license agreement.
Esteve [Member]
In relation to the company Esteve.
Raw materials
us-gaap_StockholdersEquity
Total stockholders’ equity
Balances
Balances
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Forfeited, Weighted Average Grant-Date Fair Value Per Unit (in dollars per share)
Semi-finished goods
Stock, Class of Stock [Table]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
us-gaap_InventoryValuationReserves
Inventory Valuation Reserves
Less: excess and obsolete inventory reserve
Operating lease right-of-use assets, net
Operating Lease, Right-of-Use Asset
Other long-term liabilities
Total net revenues
Revenue from Contract with Customer, Excluding Assessed Tax
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
Property, Plant, and Equipment [Table Text Block]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
Inventory, Policy [Policy Text Block]
Commitments and contingencies (Note 12)