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Note 7 - Discontinued Operations - Sale of OMIDRIA (Details Textual) $ in Billions	Dec. 29, 2022 USD ($)
Omidria Assets Disposal [Member] | Discontinued Operations, Disposed of by Sale [Member]
Milestone Payment Receivable from Sale of Royalty Under Asset Purchase Agreement	$ 0.2

X

- Definition

Amount of milestone payment receivable form sale of royalty under asset purchase agreement.

+ References

No definition available.

+ Details

Name:	omer_MilestonePaymentReceivableFromSaleOfRoyaltyUnderAssetPurchaseAgreement
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=omer_OmidriaAssetsDisposalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: