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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: |