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Note 7 - Discontinued Operations - Sale of OMIDRIA - Contract Royalty Asset (Details) - Discontinued Operations, Disposed of by Sale [Member] - Omidria Assets Disposal [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
OMIDRIA contract royalty asset			$ 153,349
Royalties earned			(15,251)
Interest earned on OMIDRIA contract royalty asset	$ 3,886	$ 4,271	7,839	$ 8,614
Remeasurement adjustments	(3,149)	$ 4,314	(2,981)	$ 6,653
OMIDRIA contract royalty asset	$ 142,956		$ 142,956

X

- Definition

Amount classified as contract royalty asset attributable to disposal group held for sale or disposed of.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of effective interest on contract royalty asset attributable to disposal group, including, but not limited to, discontinued operation.

+ References

No definition available.

+ Details

Name:	omer_DisposalGroupIncludingDiscontinuedOperationEffectiveInterestOnContractRoyaltyAsset
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of remeasurement adjustments attributable to disposal group, including, but not limited to, discontinued operation.

+ References

No definition available.

+ Details

Name:	omer_DisposalGroupIncludingDiscontinuedOperationRemeasurementAdjustments
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of royalty revenue earned attributable to disposal group, including, but not limited to, discontinued operation.

+ References

No definition available.

+ Details

Name:	omer_DisposalGroupIncludingDiscontinuedOperationRoyaltyRevenueEarned
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

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