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Note 7 - Discontinued Operations - Sale of OMIDRIA (Details Textual) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 23, 2021	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 29, 2022
Proceeds from Divestiture of Businesses			$ 0	$ 0	$ 125,993
Percentage of Royalty Receivable on Sale of Product Rights	50.00%	30.00%
Omidria Assets Disposal [Member] | Discontinued Operations, Disposed of by Sale [Member]
Proceeds from Divestiture of Businesses	$ 126,000				$ 125,993
Milestone Payment Receivable from Sale of Royalty Under Asset Purchase Agreement		$ 200,000		$ 200,000		$ 200,000
Percentage of Royalty Receivable on Sale of Product Rights	50.00%	30.00%

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

- Definition

Represents the percentage of royalty receivable on sale of product rights.

+ References

No definition available.

+ Details

Name:	omer_PercentageOfRoyaltyReceivableOnSaleOfProductRights
Namespace Prefix:	omer_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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: