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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
OMIDRIA contract royalty asset |  |  | $ 168,109 |
Royalties earned |  |  | (29,586) |
Interest earned on OMIDRIA contract royalty asset | $ 4,210 | $ 3,730 | 12,824 | $ 11,484
Remeasurement adjustments | 731 | $ 10,100 | 7,384 | $ 14,924
OMIDRIA contract royalty asset | $ 158,731 |  | $ 158,731 |

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: |