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Note 8 - OMIDRIA Royalty Obligation - Schedule of Royalty Obligation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Principal amount borrowed at December 31, 2022 | $ 126,278 |  |
Principal payments | (1,152) | $ (417) | $ 0
OMIDRIA royalty obligation at December 31, 2023 | $ 125,126 | $ 126,278 |

X
- Definition Represents principal payments on royalty obligations. + References No definition available. + Details
Name: | omer_PrincipalPaymentsOnRoyaltyObligations
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of royalty obligation. + References No definition available. + Details
Name: | omer_RoyaltyObligations
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant