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Note 5 - Certain Balance Sheet Accounts - Contract Royalty Asset (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Short-term contract royalty asset	$ 28,221	$ 29,083
Long-term contract royalty asset	114,735	124,266
Total OMIDRIA contract royalty asset	$ 142,956	$ 153,349

X

- Definition

The amount of contract royalty asset.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of contract royalty asset, classified as current.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of contract royalty asset, classified as noncurrent.

+ References

No definition available.

+ Details

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