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Significant Accounting Policies (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 23, 2021
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Discontinued Operation | Omidria Assets Disposal |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Milestone payment receivable | $ 200.0 | $ 200.0

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- Definition Amount of milestone payment receivable form sale of royalty under asset purchase agreement. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=omer_OmidriaAssetsDisposalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |