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Note 8 - OMIDRIA Royalty Obligation (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Feb. 29, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Feb. 01, 2024
Minimum [Member] |  |  |  |  |
Milestone Benchmark One, If Milestone Achieves |  | $ 10.0 |  |  |
Milestone Benchmark One, Minimum Net Sales Required for Four Consecutive Quarters |  | 156.0 |  |  |
Milestone Benchmark Two, If Milestone Achieves |  | 8.0 |  |  |
Milestone Benchmark Two, Minimum Net Sales Required for Four Consecutive Quarters |  | 181.0 |  |  |
Maximum [Member] |  |  |  |  |
Milestone Benchmark One, If Milestone Achieves |  | 27.5 |  |  |
Milestone Benchmark One, Minimum Net Sales Required for Four Consecutive Quarters |  | 160.0 |  |  |
Milestone Benchmark Two, If Milestone Achieves |  | 27.5 |  |  |
Milestone Benchmark Two, Minimum Net Sales Required for Four Consecutive Quarters |  | 185.0 |  |  |
DRI Healthcare Acquisition LP [Member] |  |  |  |  |
Proceeds From Royalty Obligation | $ 125.0 | $ 115.5 |  |  |
Royalty Obligation, Fair Value |  |  | $ 191.9 | $ 209.7 |
Royalty Interest Rate |  | 10.27% |  |  | 10.27%

X
- Definition Represents the amount of net sales that allows the milestone to be reached. + References No definition available. + Details
Name: | omer_MilestoneBenchmarkOneIfMilestoneAchieves
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum net seals require for four consecutive periods. + References No definition available. + Details
Name: | omer_MilestoneBenchmarkOneMinimumNetSalesRequiredForFourConsecutiveQuarters
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of sales required for the second milestone. + References No definition available. + Details
Name: | omer_MilestoneBenchmarkTwoIfMilestoneAchieves
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount required for the milestone two for four consecutive periods. + References No definition available. + Details
Name: | omer_MilestoneBenchmarkTwoMinimumNetSalesRequiredForFourConsecutiveQuarters
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cash proceeds from royalty obligation. + References No definition available. + Details
Name: | omer_ProceedsFromRoyaltyObligation
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of interest on royalty obligation. + References No definition available. + Details
Name: | omer_RoyaltyInterestRate
Namespace Prefix: | omer_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=omer_DRIHealthcareAcquisitionLpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |