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Note 5 - Certain Balance Sheet Accounts - Schedule of Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
OMIDRIA milestone receivable	$ 0	$ 200,000
OMIDRIA royalty receivables	6,724	12,966
Other receivables	1,372	255
Total receivables	$ 8,096	$ 213,221

X

- Definition

Represents the amount of milestone payment receivable.

+ References

No definition available.

+ Details

Name:	omer_MilestonePaymentReceivable
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of royalty receivables.

+ References

No definition available.

+ Details

Name:	omer_RoyaltyReceivable
Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

+ Details

Name:	us-gaap_ReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant