Document And Entity Information
PDE7 [Member]
Represents PDE7.
Statistical Measurement [Axis]
Note To Financial Statement Details Textual
Significant Accounting Policies
us-gaap_IncomeTaxExpenseBenefit
Income tax expense
National Institute on Drug Abuse (“NIDA”) [Member]
Represents National Institute on Drug Abuse (“NIDA”).
Note 3 - Net Income (Loss) Per Share
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Note 4 - Fair-value Measurements
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Note 5 - Certain Balance Sheet Accounts
Trading Arrangements, by Individual [Table]
Note 6 - Debt
Material Terms of Trading Arrangement [Text Block]
Note 7 - Discontinued Operations - Sale of OMIDRIA
Note 8 - OMIDRIA Royalty Obligation
Financial Instrument [Axis]
Note 9 - Lease Liabilities
Note 12 - Stock-based Compensation
Note 3 - Net Income (Loss) Per Share - Schedule of Antidilutive Securities (Details)
Minimum [Member]
Note 4 - Fair-value Measurements - Fair Value Hierarchy (Details)
omer_RoyaltyInterestRate
Royalty Interest Rate
Percentage of interest on royalty obligation.
Statistical Measurement [Domain]
Note 4 - Fair-value Measurements - Embedded Derivative Assumptions (Details)
Maximum [Member]
us-gaap_SharePrice
Share Price
Note 4 - Fair-value Measurements - Changes in Level 3 Liabilities (Details)
Share Repurchase Program [Axis]
Note 5 - Certain Balance Sheet Accounts - Contract Royalty Asset (Details)
Share Repurchase Program [Domain]
Note 5 - Certain Balance Sheet Accounts - OMIDRIA Royalty Obligation (Details)
Note 5 - Certain Balance Sheet Accounts - Schedule of Receivables (Details)
Note 5 - Certain Balance Sheet Accounts - Property and Equipment, Net (Details)
Note 5 - Certain Balance Sheet Accounts - Schedule of Accrued Liabilities (Details)
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expense
Note 6 - Debt - Debt Balances (Details)
Certificates of Deposit [Member]
Note 6 - Debt - Schedule of Convertible Debt (Details)
Note 6 - Debt - Schedule of Debt Instruments (Details)
omer_EquityOfferingMaximumAvailableToSell
Equity Offering, Maximum Available to Sell
Maximum amount of shares available to sell under equity offering.
Note 7 - Discontinued Operations - Sale of OMIDRIA - Net Income From Discontinued Operations (Details)
Note 7 - Discontinued Operations - Sale of OMIDRIA - Contract Royalty Asset (Details)
Note 7 - Discontinued Operations - Sale of OMIDRIA - Schedule of Discontinued Operations Cash Flows (Details)
Note 8 - OMIDRIA Royalty Obligation - Schedule of Royalty Obligation (Details)
Note 8 - OMIDRIA Royalty Obligation - Interest Expense (Details)
omer_GrantsReceivablePeriod
Grants Receivable, Period
Period of award for grants receivable.
Note 8 - OMIDRIA Royalty Obligation - Schedule of Principal and Interest Payments on Royalty Obligations (Details)
Note 9 - Lease Liabilities - Lease Cost (Details)
Money-market funds
us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Note 12 - Stock-based Compensation - Schedule of Recognized Period Costs (Details)
Note 12 - Stock-based Compensation - Schedule of Recognized Period Costs 2 (Details)
Counterparty Name [Axis]
Note 12 - Stock-based Compensation - Valuation Assumptions (Details)
Note 12 - Stock-Based Compensation - Stock Option Activity (Details)
Notes To Financial Statements
Forfeited, weighted average exercise price (in dollars per share)
Notes To Financial Statements [Abstract]
Granted, weighted average exercise price (in dollars per share)
Exercised, weighted average exercise price (in dollars per share)
Interest and other income
Financial Instruments [Domain]
us-gaap_InterestIncomeExpenseNonoperatingNet
Interest expense, net of remeasurement on OMIDRIA royalty obligation
Asset Purchase and License Agreement With Novo Nordisk HealthCare AG [Member]
Represents the Asset Purchase and License Agreement with Novo Nordisk HealthCare AG.
omer_UpfrontAndNeartermMilestonePaymentsReceivableUponClosing
Upfront and Near-term Milestone Payments Receivable, Upon Closing
Amount of up front and near-term milestone payments to be received upon closing.
us-gaap_IncreaseDecreaseInInventories
Inventory
Counterparty Name [Domain]
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Award Type [Axis]
Preferred stock, par value $0.01 per share, 20,000,000 shares authorized; none issued and outstanding at March 31, 2026 and December 31, 2025.
Adjustments to reconcile net income (loss) to net cash used in operating activities:
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and shareholders’ deficit
us-gaap_IncreaseDecreaseInReceivables
Receivables
us-gaap_AllocatedShareBasedCompensationExpense
Stock-based compensation
Embedded derivative
us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeNet
Embedded Derivative, Fair Value of Embedded Derivative, Net
Fair value of embedded derivative
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other
Embedded derivative reported at fair value
us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Condensed Balance Sheet Statement [Table]
Selling, general and administrative
Stock-based compensation expense
us-gaap_ShareBasedCompensation
us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Unamortized debt discount, net of issuance costs
2029 Notes, non-current, net
omer_CommonStockSharesOutstandingAbovePeriodEndClosingPrice
Common Stock, Shares, Outstanding, Above Period End Closing Price
The amount of common stock shares above period end closing price.
Lessee, Lease, Description [Table]
2026 Notes, net
Share-Based Payment Arrangement [Text Block]
Location, Statement of Income, Balance [Axis]
Lease Contractual Term [Axis]
Lease Contractual Term [Domain]
Changes in operating assets and liabilities:
Preferred Stock, Shares Issued (in shares)
Preferred Stock, Shares Outstanding (in shares)
Preferred Stock, Shares Authorized (in shares)
Fair Value, by Balance Sheet Grouping [Table]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)
us-gaap_RestrictedCashCurrent
Restricted Cash, Current
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net increase (decrease) in cash and cash equivalents
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Beginning balance
Ending balance
Certificate of deposit classified as non-current restricted investments
us-gaap_CashAndCashEquivalentsFairValueDisclosure
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]
Antidilutive Securities, Name [Domain]
us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Debt Instrument, Convertible, Threshold Consecutive Trading Days
Statement [Table]
Cash payments for operating leases
2030 and thereafter, annual cap
omer_RoyaltyObligationPaymentsDueAfterYearFour
Amount of total royalty obligation due after fourth fiscal year following current fiscal year.
2030 and thereafter, interest
omer_RoyaltyObligationInterestPaymentsDueAfterYearFour
Amount of interest portion of royalty obligation due after fourth fiscal year following current fiscal year.
2030 and thereafter, principal
omer_RoyaltyObligationPrincipalPaymentsDueAfterYearFour
Amount of principal portion of royalty obligation due after fourth fiscal year following current fiscal year.
us-gaap_FinanceLeasePrincipalPayments
Payments on finance lease obligations
Equipment [Member]
srt_StockRepurchaseProgramAuthorizedAmount1
Share Repurchase Program, Authorized, Amount
Long-Term Debt, Type [Axis]
Product and Service [Domain]
Product and Service [Axis]
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant, and Equipment, Useful Life
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Estimated weighted-average fair value (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Forfeited, options (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Exercisable, options (in shares)
Exercisable, weighted average exercise price (in dollars per share)
Measurement Frequency [Axis]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Beginning balance, options (in shares)
Ending balance, options (in shares)
Commitments and Contingencies Disclosure [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Beginning balance, weighted average exercise price (in dollars per share)
Ending balance, weighted average exercise price (in dollars per share)
Statement [Line Items]
Fair Value Hierarchy and NAV [Axis]
Balance, Intrinsic Value
Common Stock, Shares, Issued (in shares)
Common Stock, Shares, Outstanding (in shares)
Award Type [Domain]
Risk-free interest rate
Common Stock, Shares Authorized (in shares)
Expected volatility
Expected dividend yield
Schedule of Accrued Liabilities [Table Text Block]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Common stock, par value $0.01 per share, 150,000,000 shares authorized at March 31, 2026 and December 31, 2025; 71,998,632 and 71,670,791 shares issued and outstanding at March 31, 2026 and December 31, 2025, respectively.
Amortization
Accounts payable
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
us-gaap_TableTextBlock
Notes Tables
Computer Equipment [Member]
Loans Payable [Member]
Disposal Group Classification [Axis]
Disposal Group Classification [Domain]
Short-term investments
Proceeds from the sale and maturities of investments
Consulting and professional fees
Short-term
us-gaap_ShortTermBorrowings
Accrued expenses
Total accrued expenses
omer_DebtInstrumentConvertiblePeriodAfterConversionDateForInterestPayment
Debt Instrument, Convertible, Period After Conversion Date for Interest Payment
Period after conversion for interest payments on convertible debt instruments.
Interest
Cash payments for financing leases
Schedule of Interest Expense on Royalty Obligation [Table Text Block]
Tabular disclosure of interest expense on royalty obligation.
Employee compensation
Significant Accounting Policies [Text Block]
us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Debt Instrument, Convertible, Threshold Trading Days
us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger
Balance, Remaining Contractual Life (Year)
Other accrued expenses
omer_DebtInstrumentConvertibleTradingDaysBeforeMaturity
Debt Instrument, Convertible, Trading Days Before Maturity
Period of trading days before maturity within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.
omer_RemeasurementAdjustmentOnInterestExpenseNonoperating
Non-cash remeasurement adjustment
Amount of remeasurement adjustment on interest expense, classified as nonoperating activities.
Interest payable
omer_DebtConversionOriginalDebtNetAmount
Debt Conversion, Original Debt, Net Amount
The net amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
us-gaap_ProceedsFromSaleOfProductiveAssets
Proceeds from Sale of Productive Assets
Vested and expected to vest, Remaining Contractual Life (Year)
Expected life, in years (Year)
Exercisable, Remaining Contractual Life (Year)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Long-term
us-gaap_LongTermDebt
Change in Fair Value
Statement of Stockholders' Equity [Abstract]
Statement of Cash Flows [Abstract]
Convertible Debt [Member]
Shareholders’ deficit:
Long-Term Debt, Type [Domain]
Equity Components [Axis]
Share-Based Payment Arrangement [Policy Text Block]
Equity Component [Domain]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 1 [Member]
Equity [Text Block]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Cost of product sales
Property and equipment, net
Total property and equipment, net
Property and equipment, gross
Property, Plant, and Equipment [Policy Text Block]
Sale of Stock [Axis]
Cost of Goods and Service [Policy Text Block]
Furniture and Fixtures [Member]
Stock-based compensation expense
Fair Value Disclosures [Text Block]
Share-Based Payment Arrangement, Option [Member]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Supplemental cash flow information
Current liabilities:
us-gaap_LiabilitiesCurrent
Total current liabilities
Trade receivables, net
Lease, Cost [Table Text Block]
Lessee, Leases [Policy Text Block]
Long-Term Debt [Text Block]
Other Commitments [Table]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less accumulated depreciation and amortization
Net cash provided by discontinued operations from operating activities
us-gaap_ContractWithCustomerReceivableCreditLossExpenseReversal
Contract with Customer, Receivable, Credit Loss Expense (Reversal)
Selling, General and Administrative Expenses, Policy [Policy Text Block]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (loss) from continuing operations before income tax expense
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of investments
Additional paid-in capital
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Debt Conversion, Name [Domain]
Segment Reporting, Policy [Policy Text Block]
Debt Conversion Description [Axis]
Discontinued Operations, Disposed of by Sale [Member]
Prepaid expense and other assets
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
Debt Instrument, Convertible, Number of Equity Instruments
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
us-gaap_DebtInstrumentCarryingAmount
Long-Term Debt, Gross
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchases of common stock
Stock Repurchased and Retired During Period, Value
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Current assets:
Amortization of discount and issuance costs
Amortization of debt premium and issuance costs
Issuance of common stock upon exercise of stock options
Money Market Funds [Member]
Schedule of Debt [Table Text Block]
us-gaap_AssetsCurrent
Total current assets
us-gaap_GrantsReceivable
Grants Receivable
Long-term contract royalty asset
OMIDRIA contract royalty asset, non-current
Amount of contract royalty asset, classified as noncurrent.
Short-term contract royalty asset
OMIDRIA contract royalty asset
Amount of contract royalty asset, classified as current.
Debt Instrument, Name [Domain]
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Issuance of common stock upon exercise of stock options (in shares)
Exercised, options (in shares)
us-gaap_DebtInstrumentMaturityDate
Debt Instrument, Maturity Date
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
us-gaap_Depreciation
Depreciation
us-gaap_DebtInstrumentInterestRateEffectivePercentage
Debt Instrument, Interest Rate, Effective Percentage
us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Repurchases of common stock (in shares)
Stock Repurchased and Retired During Period, Shares
OMIDRIA royalty obligation, non-current
The amount of royalty obligation, classified as noncurrent.
Schedule of Long-Term Debt Instruments [Table]
Clinical trials
Amount of accrued clinical trial costs, classified as current.
Debt Instrument [Axis]
Net gain (loss) on change in fair value of financial instruments
Remeasurement on fair value of financial instruments
Unrealized Gain (Loss) on Derivatives
Operating activities:
Investing activities:
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash used in operating activities
Financing activities:
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by investing activities
Contract research and development
Amount of accrued contract research and development, classified as current.
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
us-gaap_TreasuryStockAcquiredAverageCostPerShare
Shares Acquired, Average Cost Per Share
Zaltenibart [Member]
Represents Zaltenibart.
Stockholders' Equity, Policy [Policy Text Block]
Long-term OMIDRIA royalty obligation
omer_RoyaltyObligationsNoncurrent
Amount of royalty obligations, classified as noncurrent.
Short-term OMIDRIA royalty obligation
omer_RoyaltyObligationsCurrent
Amount of royalty obligation, classified as current.
us-gaap_LiabilitiesFairValueDisclosure
Total Liabilities
us-gaap_InterestExpenseDebtExcludingAmortization
Contractual interest expense
us-gaap_AssetsFairValueDisclosure
Total Assets
Share-Based Payment Arrangement, Activity [Table Text Block]
Receivables
Total receivables
Office and Laboratory Facilities [Member]
Represents office and laboratory facilities.
Accounting Policies [Abstract]
omer_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense
Other income (loss), net
Amount of other income (expense) attributable to disposal group, including, but not limited to, discontinued operation.
Long-Term Purchase Commitment [Table]
Accounts Receivable [Policy Text Block]
Net income (loss) from continuing operations (in dollars per share)
us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Net income (loss) from continuing operations (in dollars per share)
us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
us-gaap_IncomeLossFromContinuingOperations
Net income (loss) from continuing operations
Remeasurement of OMIDRIA contract royalty asset
omer_NoncashRoyaltyInterest
Represents the amount of noncash royalty interest during the period.
Measurement Input Type [Axis]
Income Statement [Abstract]
us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income before income tax
Net income from discontinued operations (in dollars per share)
us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
us-gaap_NumberOfOperatingSegments
Number of Operating Segments
Net income from discontinued operations (in dollars per share)
us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Measurement Input, Expected Dividend Rate [Member]
Measurement Input, Expected Term [Member]
Share Repurchase Program - 2025 [Member]
Represents the Share Repurchase Program - 2025.
Measurement Input, Discount Rate [Member]
Net loss
Net income (loss)
Measurement Input, Price Volatility [Member]
Debt, Long-Term and Short-Term, Combined Amount
us-gaap_DebtLongtermAndShorttermCombinedAmount
us-gaap_AmortizationOfFinancingCosts
Amortization of debt discount and issuance costs
Costs and expenses:
us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income tax benefit
Measurement Input, Share Price [Member]
Measurement Input Type [Domain]
Measurement Input, Risk Free Interest Rate [Member]
omer_InterestOnContractRoyaltyAsset
Non-cash interest on OMIDRIA contract royalty asset
The amount of interest on contract royalty asset.
Derivative, assumption
us-gaap_DebtConversionOriginalDebtAmount1
Debt Conversion, Original Debt, Amount
Convertible Debt [Table Text Block]
us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Debt Conversion, Converted Instrument, Shares Issued (in shares)
us-gaap_CostsAndExpenses
Total costs and expenses
Costs and Expenses
Non-cash interest remeasurement on OMIDRIA royalty obligation
omer_NonCashInterestExpenseOnRoyaltyObligation
Amount of non-cash interest expense on royalty obligation.
Accounting Standards Update and Change in Accounting Principle [Table]
Development Milestones [Member]
Information pertaining to development milestones.
Income Tax, Policy [Policy Text Block]
At the Market Equity Offering Program [Member]
Information on the type of equity offering program.
The Credit and Guaranty Agreement [Member]
Relating to the Credit and Guaranty Agreement.
omer_RoyaltyObligations
Total OMIDRIA royalty obligation
OMIDRIA royalty obligation
OMIDRIA royalty obligation
Represents the amount of royalty obligation.
Schedule of Royalty Obligation [Table Text Block]
Tabular disclosure of royalty obligation.
Initial Term Loan [Member]
Relating to the Initial Term Loan.
Other receivables
Supplemental Balance Sheet Disclosures [Text Block]
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
Vested and expected to vest, options (in shares)
Vested and expected to vest, Intrinsic Value
Vested and expected to vest, weighted average exercise price (in dollars per share)
Fair Value Hierarchy and NAV [Domain]
omer_RoyaltyObligationFairValue
Royalty Obligation, Fair Value
Represents the fair value of a royalty obligation.
Measurement Frequency [Domain]
us-gaap_RepaymentsOfLongTermDebt
Repayments of Long-Term Debt
Conversion of the 2026 Notes Into 2029 Notes [Member]
Represents the conversion of the 2026 Notes into the 2029 Notes [Member]
Statement of Financial Position [Abstract]
us-gaap_ConvertibleDebtFairValueDisclosures
Fair value of outstanding debt
Schedule of Royalty Obligation, Financial Position [Table Text Block]
Tabular disclosure of royalty obligation, financial position.
Cash paid for income taxes, net
Conversion of the 2026 Notes Into Common Stock [Member]
Represents the conversion of the 2026 notes into common stock.
The 2029 Notes [Member]
Represents the 2029 Notes.
Fair Value, Recurring [Member]
us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchases of common stock
dei_DocumentType
Document Type
Demand Deposits [Member]
Document Information [Line Items]
Document Quarterly Report
us-gaap_LesseeOperatingLeaseRenewalTerm
Lessee, Operating Lease, Renewal Term (Year)
Document Information [Table]
Conversion Option Derivative [Member]
Represents the conversion option derivative.
Deferred income
Total potentially dilutive shares excluded from net income (loss) per share (in shares)
Antidilutive Securities [Axis]
Diluted net income (loss) per share:
omer_DebtInstrumentConvertiblePrincipalAmount
Principal amount
Represents the amount of principal on f a debt instrument that can be converted to another debt instrument.
dei_EntityInteractiveDataCurrent
Entity Interactive Data Current
Document Transition Report
Diluted (in shares)
Basic net income (loss) per share:
Basic (in shares)
Derivative Instrument [Axis]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
us-gaap_EarningsPerShareBasic
Net income (loss) (in dollars per share)
Antidilutive Security, Excluded EPS Calculation [Table]
Research and Development Expense, Policy [Policy Text Block]
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
OMIDRIA royalty receivables
Represents the amount of royalty receivable classified as current.
Restricted investments
Restricted Cash and Cash Equivalent, Noncurrent
us-gaap_DebtInstrumentConvertibleConversionRatio1
Debt Instrument, Convertible, Conversion Ratio
Lease liabilities, non-current
Represents the amount of operating and finance lease liabilities classified as noncurrent.
Document Fiscal Period Focus
Document Fiscal Year Focus
us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationForfeited
Net share settlement of equity awards
omer_RoyaltyObligationCurrent
OMIDRIA royalty obligation
The amount of royalty obligation, classified as current.
Amendment Flag
Restricted Cash and Cash Equivalents [Axis]
Lease liabilities
Represents the current portion of operating and finance lease liability.
Common Stock [Member]
Novo Nordisk receivable
Milestone Payment Receivable
Represents the amount of milestone payment receivable.
us-gaap_SubleaseIncome
Sublease income
Omidria Assets Disposal [Member]
Relating to Omidria Assets Disposal.
omer_PrincipalPaymentsOnRoyaltyObligations
Principal payments on OMIDRIA royalty obligation
Represents principal payments on royalty obligations.
omer_IncreaseDecreaseInContractRoyaltyAsset
OMIDRIA contract royalty asset
Represents the amount of increase (decrease) in contract royalty asset during the period.
dei_DocumentPeriodEndDate
Document Period End Date
us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited
Net share settlement of equity awards (in shares)
Exercise of stock options
Represents the proceeds from stock option and warrant exercises.
DRI Healthcare Acquisition LP [Member]
Relating to DRI Healthcare Acquisition LP.
Long-Lived Asset, Class [Domain]
Variable lease cost
Granted, options (in shares)
Legal Entity [Axis]
Operating lease cost
omer_EquityOfferingFacilityMaximumAggregateOfferingAmount
Equity Offering Facility, Maximum Aggregate Offering Amount
Represents the maximum aggregate offering amount on an equity offering facility.
omer_ProceedsFromRoyaltyObligation
Proceeds From Royalty Obligation
Represents the cash proceeds from royalty obligation.
omer_PercentageOfInterestEarnedOnOutstandingContractRoyaltyAsset
Percentage Of Interest Earned on Outstanding Contract Royalty Asset
Represents the percentage of interest earned on outstanding contract royalty asset.
us-gaap_LeaseCost
Net lease cost
Interest earned on OMIDRIA contract royalty asset
Interest on OMIDRIA contract royalty asset
The amount of effective interest on contract royalty asset attributable to disposal group, including, but not limited to, discontinued operation.
dei_EntityFileNumber
Entity File Number
omer_DisposalGroupIncludingDiscontinuedOperationRoyaltyRevenueEarned
Royalties earned
The amount of royalty revenue earned attributable to disposal group, including, but not limited to, discontinued operation.
Entity Tax Identification Number
Schedule Of Disposal Groups Including Discontinued Operations Cash Flows [Table Text Block]
Tabular disclosure of information relating to discontinued operations cash flows.
Remeasurement adjustments
Remeasurement adjustments
The amount of remeasurement adjustments attributable to disposal group, including, but not limited to, discontinued operation.
Royalty Obligation Policy [Policy Text Block]
Disclosure of the company's policy regarding royalty obligation policy.
Entity [Domain]
Entity Central Index Key
omer_DisposalGroupIncludingDiscontinuedOperationContractRoyaltyAsset
OMIDRIA contract royalty asset
OMIDRIA contract royalty asset
Amount classified as contract royalty asset attributable to disposal group held for sale or disposed of.
dei_EntityRegistrantName
Entity Registrant Name
Disposal Groups, Including Discontinued Operations, Contract Royalty Asset [Table Text Block]
The tabular disclosure of information related to a disposal group of contract royalty asset. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.
Finance Lease Equipment [Member]
Relating to finance lease equipment.
dei_EntityCurrentReportingStatus
Entity Current Reporting Status
Entity Incorporation, State or Country Code
Convertible Senior Notes 2026 [Member]
Relating to 2026 convertible senior notes.
Current Fiscal Year End Date
omer_ContractRoyaltyAsset
Total OMIDRIA contract royalty asset
The amount of contract royalty asset.
Schedule Of Contract Royalty Asset [Table Text Block]
Tabular disclosure of contract royalty asset.
Royalty Obligation [Text Block]
Disclosure of the company's royalty obligation.
Maximum Scheduled Principal and Interest Payments of Royalty Obligation [Table Text Block]
Tabular disclosure of maximum scheduled principal and interest payments on royalty obligations.
Research and development
Royalty Obligation [Member]
Relating to royalty obligation.
Entity Filer Category
dei_EntityShellCompany
Entity Shell Company
Entity Emerging Growth Company
Schedule Of Debt Instrument, Interest Expense Recognized [Table Text Block]
Tabular disclosure of interest expense recognized relating to debt instrument.
Entity Small Business
omer_DebtInstrumentConvertibleDebtDenominatorAmount
Debt Instrument, Convertible Debt, Denominator Amount
Represents the denominator amount used in the calculation of convertible debt.
us-gaap_OperatingIncomeLoss
Loss from operations
Cash and Cash Equivalents [Domain]
omer_MilestoneBenchmarkOneIfMilestoneAchieves
Milestone Benchmark One, If Milestone Achieves
Represents the amount of net sales that allows the milestone to be reached.
2026, interest
omer_RoyaltyObligationInterestPaymentsDueRemainderOfFiscalYear
Amount of interest portion of royalty obligation to be paid in remainder of current fiscal year.
omer_RoyaltyObligationPrincipalPaymentsDue
Total scheduled payments, principal
Amount of total principal portion of royalty obligation.
2027, principal
omer_RoyaltyObligationPrincipalPaymentsDueNextTwelveMonths
Amount of principal portion of royalty obligation to be paid in next fiscal year following current fiscal year.
2026, principal
omer_RoyaltyObligationPrincipalPaymentsDueRemainderOfFiscalYear
Amount of principal portion of royalty obligation to be paid in remainder of current fiscal year.
2029, principal
omer_RoyaltyObligationPrincipalPaymentsDueYearThree
Amount of principal portion of royalty obligation to be paid in third fiscal year following current fiscal year.
2028, principal
omer_RoyaltyObligationPrincipalPaymentsDueYearTwo
Amount of principal portion of royalty obligation to be paid in second fiscal year following current fiscal year.
omer_RoyaltyObligationInterestPaymentsDue
Total scheduled payments, interest
Amount of total interest portion of royalty obligation.
2027, annual cap
omer_RoyaltyObligationPaymentsDueNextTwelveMonths
Amount of total royalty obligation to be paid in next fiscal year following current fiscal year.
Remeasurement on the OMIDRIA royalty obligation
2026, annual cap
omer_RoyaltyObligationPaymentsDueRemainderOfFiscalYear
Amount of total royalty obligation to be paid in the remainder of the current fiscal year.
2028, interest
omer_RoyaltyObligationInterestPaymentsDueYearTwo
Amount of interest portion of royalty obligation to be paid in second fiscal year following current fiscal year.
2027, interest
omer_RoyaltyObligationInterestPaymentsDueNextTwelveMonths
Amount of interest portion of royalty obligation to be paid in next fiscal year following current fiscal year.
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares
2029, interest
omer_RoyaltyObligationInterestPaymentsDueYearThree
Amount of interest portion of royalty obligation to be paid in third fiscal year following current fiscal year.
2029 Notes embedded derivative, non-current
Other accrued liabilities, non-current
us-gaap_InterestExpenseDebt
Total interest expense
omer_RoyaltyObligationPaymentsDue
Total scheduled payments, annual cap
Amount of total royalty obligation.
Entity Address, State or Province
omer_NumberOfOptionsToExtendLeaseTerm
Number Of Options To Extend Lease Term
Represents the number of options to extend lease term.
Entity Address, City or Town
Lease Disclosure [Text Block]
The entire disclosure of information about leases.
us-gaap_InterestExpenseNonoperating
Interest expense, net of remeasurement adjustments
Pass through interest remitted through administrative agent
Accumulated deficit
2028, annual cap
omer_RoyaltyObligationPaymentsDueYearTwo
Amount of total royalty obligation to be paid in second fiscal year following current fiscal year.
Entity Address, Address Line One
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
2029, annual cap
omer_RoyaltyObligationPaymentsDueYearThree
Amount of total royalty obligation to be paid in third fiscal year following current fiscal year.
City Area Code
omer_LongtermPurchaseCommitmentTerminationFee
Long-Term Purchase Commitment, Termination Fee
Represents the amount of termination fee on a long-term purchase commitment.
us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net share settlement of equity awards
Local Phone Number
Entity Address, Postal Zip Code
Title of 12(b) Security
Security Exchange Name
Trading Symbol
Derivatives, Policy [Policy Text Block]
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price
Class of Stock [Axis]
Revenue [Policy Text Block]
dei_EntityCommonStockSharesOutstanding
Entity Common Stock, Shares Outstanding (in shares)
Earnings Per Share [Text Block]
omer_MilestoneBenchmarkTwoMinimumNetSalesRequiredForFourConsecutiveQuarters
Milestone Benchmark Two, Minimum Net Sales Required for Four Consecutive Quarters
Amount required for the milestone two for four consecutive periods.
omer_MilestoneBenchmarkTwoIfMilestoneAchieves
Milestone Benchmark Two, If Milestone Achieves
Amount of sales required for the second milestone.
Weighted-average shares used in per share computation:
Income taxes payable
Exercisable, Intrinsic Value
Common Stock, Par or Stated Value Per Share (in dollars per share)
Additions
Derivative Contract [Domain]
Long-Lived Asset, Class [Axis]
Sale of Stock [Domain]
us-gaap_Assets
Total assets
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash and cash equivalents
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Net income (loss) from discontinued operations, net of tax
us-gaap_EarningsPerShareDiluted
Net income (loss) (in dollars per share)
Depreciation and amortization
Debt, Policy [Policy Text Block]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Disposal Group Name [Domain]
Cash paid for interest
us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Ex-U.S. royalties
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table Text Block]
Inventory
us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Net income from discontinued operations, net of tax
Disposal Group Name [Axis]
us-gaap_DeferredFinanceCostsCurrentNet
Unamortized debt issuance costs
Discontinued Operations, Policy [Policy Text Block]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
us-gaap_StockholdersEquity
Total shareholders’ deficit
Balance
Balance
Stock, Class of Stock [Table]
Nature of Operation, Product Information, Concentration of Risk [Table]
Right of use assets
Product sales, net
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
Property, Plant, and Equipment [Table Text Block]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
us-gaap_RepaymentsOfMediumTermNotes
Repayment of 2026 Notes
Inventory, Policy [Policy Text Block]
omer_PolicyTable