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OMIDRIA Royalty Obligation - Schedule of changes in the OMIDRIA royalty obligation (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2022 USD ($)
OMIDRIA Royalty Obligation
Principal amount borrowed at September 30, 2022	$ 125,000
Capitalized accrued interest	1,695
Principal payments	(417)
OMIDRIA royalty obligation at December 31, 2022	$ 126,278

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- Definition

No definition available

+ References

No definition available.

+ Details

Name:	omer_RoyaltyObligationAbstract
Namespace Prefix:	omer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of capitalized interest related to OMIDRIA royalty obligation.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of principal payments related to OMIDRIA royalty obligation.

+ References

No definition available.

+ Details

Name:	omer_RoyaltyObligationPrincipalPayments
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of OMIDRIA royalty obligation.

+ References

No definition available.

+ Details

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