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Note 11 - Shareholders' Equity (Deficit) - Schedule of Reserved Shares (Details)	Dec. 31, 2023 shares
Total shares reserved (in shares)	24,057,403
2017 Omnibus Incentive Compensation Plan [Member]
Total shares reserved (in shares)	8,802,249
Share-Based Payment Arrangement, Option [Member]
Total shares reserved (in shares)	15,255,154

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PlanNameAxis=omer_OmnibusIncentiveCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: