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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Long-Term Purchase Commitment, Termination Fee | $ 5.6 |
License [Member] | Development Milestones [Member] |  |
Accrued Liabilities |  | $ 5.0

X
- Definition Represents the amount of termination fee on a long-term purchase commitment. + References No definition available. + Details
Name: | omer_LongtermPurchaseCommitmentTerminationFee
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_LicenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=omer_DevelopmentMilestonesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |