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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