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Commitments and Contingencies (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Commitments and Contingencies. |  |  |
Contract termination fees | $ 24.2 |  |
Development milestone payable | $ 0.3 | $ 0.5 | $ 5.5

X
- Definition Amount of development milestone payable. + References No definition available. + Details
Name: | omer_DevelopmentMilestonePayable
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-Term Purchase Commitment, Termination Fee + References No definition available. + Details
Name: | omer_LongTermPurchaseCommitmentTerminationFee
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration