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Note 8 - OMIDRIA Royalty Obligation (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 01, 2024 | Sep. 30, 2022 | Feb. 29, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Interest Expense, Operating and Nonoperating |  |  |  | $ 4,052 | $ 7,916 | $ 21,498 | $ 23,781
Minimum [Member] |  |  |  |  |  |  |
Milestone Benchmark One, If Milestone Achieves |  |  | $ 10,000 |  |  |  |
Milestone Benchmark Two, If Milestone Achieves |  |  | 156,000 |  |  |  |
Milestone Benchmark Three, Minimum Net Sales Required for Four Consecutive Quarters |  |  | 8,000 |  |  |  |
Milestone Benchmark Four, Minimum Net Sales Required for Four Consecutive Quarters |  |  | 181,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Milestone Benchmark One, If Milestone Achieves |  |  | 27,500 |  |  |  |
Milestone Benchmark Two, If Milestone Achieves |  |  | 160,000 |  |  |  |
Milestone Benchmark Three, Minimum Net Sales Required for Four Consecutive Quarters |  |  | 27,500 |  |  |  |
Milestone Benchmark Four, Minimum Net Sales Required for Four Consecutive Quarters |  |  | 185,000 |  |  |  |
DRI Healthcare Acquisition LP [Member] |  |  |  |  |  |  |
Proceeds From Royalty Obligation | $ 115,500 | $ 125,000 | $ 115,500 |  |  |  |
Royalty Interest Rate | 10.27% |  | 10.27% |  |  |  |
Royalty Obligation, Fair Value |  |  |  | 213,400 |  | 213,400 |
Interest Expense, Operating and Nonoperating |  |  |  | $ 2,200 | $ 3,000 | $ 13,700 | $ 8,900

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

X
- Definition Represents the amount of net sales that allows the milestone to be reached. + References No definition available. + Details
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Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount required for the milestone three for four consecutive periods. + References No definition available. + Details
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Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount of sales required for the second milestone. + References No definition available. + Details
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Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Represents the cash proceeds from royalty obligation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Percentage of interest on royalty obligation. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 48 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-48 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-24 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483013/835-20-50-1 + Details
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- Details
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- Details
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