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Note 10 - Commitments and Contingencies (Details Textual) $ in Millions	Jun. 30, 2025 USD ($)
Long-Term Purchase Commitment, Termination Fee	$ 3.9

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