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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 | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
OMIDRIA contract royalty asset at December 31, 2021 | $ 152,222 | $ 184,570 |
Royalties earned | 40,595 | (65,439) |
Interest on OMIDRIA contract royalty asset | 15,315 | 18,634 | $ 0
Remeasurement adjustments | 41,167 | 14,457 | 0
Royalties earned | (40,595) | 65,439 |
OMIDRIA contract royalty asset at December 31, 2022 | $ 168,109 | $ 152,222 | $ 184,570

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: |