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Note 8 - OMIDRIA Royalty Obligation - Schedule of Royalty Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Principal amount borrowed at December 31, 2022	$ 126,278
Principal payments	(1,152)	$ (417)	$ 0
OMIDRIA royalty obligation at December 31, 2023	$ 125,126	$ 126,278

X

- Definition

Represents principal payments on royalty obligations.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the amount of royalty obligation.

+ References

No definition available.

+ Details

Name:	omer_RoyaltyObligations
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant