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Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Commitments and Contingencies.
Contract termination fees	$ 32.0
Payment of technology access fees	$ 5.5

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

- Definition

The amount of payment of technology access fee during the reporting period.

+ References

No definition available.

+ Details

Name:	omer_PaymentOfTechnologyAccessFees
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration