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Note 9 - Leases | 9 Months Ended
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Sep. 30, 2024
Notes to Financial Statements |
Lease Disclosure [Text Block] | Note 9—Leases We have an operating lease for our office and laboratory facilities with an initial term that ends in November 2027 and two options to extend the lease term by an additional five years each. Restricted investments of $1.1 million represent the security deposit on our office and laboratory facilities. We have finance leases for certain laboratory and office equipment that have lease terms expiring through November 2026. Supplemental lease information is as follows:
​ |  | Three Months Ended |  |  | Nine Months Ended |
​ |  | September 30, |  |  | September 30, |
​ |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
​ |  | (In thousands) |
Lease cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease cost |  | $ | 1,610 |  |  | $ | 1,603 |  |  | $ | 4,822 |  |  | $ | 4,852 |
Finance lease cost: |  | ​ |  |  |  |  |  |  | ​ |  |  |  |  |
Amortization |  |  | 173 |  |  |  | 140 |  |  |  | 468 |  |  |  | 529 |
Interest |  |  | 26 |  |  |  | 29 |  |  |  | 122 |  |  |  | 121 |
Variable lease cost |  |  | 824 |  |  |  | 807 |  |  |  | 2,622 |  |  |  | 2,354 |
Sublease income |  |  | (364 | ) |  |  | (375 | ) |  |  | (1,138 | ) |  |  | (1,125 | )
Net lease cost |  | $ | 2,269 |  |  | $ | 2,204 |  |  | $ | 6,896 |  |  | $ | 6,731 |
Cash paid for amounts included in the measurement of lease liabilities is as follows:
​ |  | Nine Months Ended |
​ |  | September 30, |
​ |  | 2024 |  |  | 2023 |
​ |  | (In thousands) |
Cash paid for amounts included in the measurement of lease liabilities |  | ​ |  |  | ​ |
Cash payments for operating leases |  | $ | 5,272 |  |  | $ | 5,356 |
Cash payments for financing leases |  |  | 534 |  |  |  | 499 |

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- Definition The entire disclosure of information about leases. + References No definition available. + Details
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Namespace Prefix: | omer_
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- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration