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Note 8 - OMIDRIA Royalty Obligation - Schedule of Principal and Interest Payments on Royalty Obligations (Details) $ in Thousands	Jun. 30, 2025 USD ($)
2025, principal	$ 8,799
2025, interest	9,416
2025, annual cap	18,215
2026, principal	22,439
2026, interest	17,322
2026, annual cap	39,761
2027, principal	25,654
2027, interest	15,004
2027, annual cap	40,658
2028, principal	29,068
2028, interest	12,372
2028, annual cap	41,440
Thereafter, principal	111,718
Thereafter, interest	17,645
Thereafter, annual cap	129,363
Total scheduled payments, principal	197,678
Total scheduled payments, interest	71,759
Total scheduled payments, annual cap	$ 269,437

X

- Definition

Amount of total interest portion of royalty obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest portion of royalty obligation due after fourth fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest portion of royalty obligation to be paid in next fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest portion of royalty obligation to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest portion of royalty obligation to be paid in third fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of interest portion of royalty obligation to be paid in second fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation due after fourth fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation to be paid in next fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation to be paid in the remainder of the current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation to be paid in third fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total royalty obligation to be paid in second fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of total principal portion of royalty obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of principal portion of royalty obligation due after fourth fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of principal portion of royalty obligation to be paid in next fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of principal portion of royalty obligation to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of principal portion of royalty obligation to be paid in third fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of principal portion of royalty obligation to be paid in second fiscal year following current fiscal year.

+ References

No definition available.

+ Details

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