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OMIDRIA Royalty Obligation - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022
Royalty Obligation |  |
Proceeds upon entering into OMIDRIA royalty obligation |  | $ 125,000
Total contractual interest expense |  | 2,900
Non-cash contractual interest expense |  | 1,700
Cash contractual interest expense |  | 1,200
DRI |  |
Royalty Obligation |  |
Proceeds upon entering into OMIDRIA royalty obligation | $ 125,000 |
Amount of total royalties to be received no sooner than August 2028 |  | 125,000
Maximum payout payable |  | $ 186,800
Maximum Royalty Payable Percentage | 9.40% |

X
- Definition The amount of cash contractual interest expense related to OMIDRIA royalty obligation. + References No definition available. + Details
Name: | omer_CashContractualInterestExpenseOnRoyaltyObligation
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of total contractual interest expense incurred related to OMIDRIA royalty obligation. + References No definition available. + Details
Name: | omer_ContractualInterestExpenseOnRoyaltyObligation
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Future royalty payments to be received. + References No definition available. + Details
Name: | omer_FutureRoyaltyProceedsToBeReceived
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The maximum amount of payout payable. + References No definition available. + Details
Name: | omer_MaximumPayoutPayable
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents maximum royalty payable percentage. + References No definition available. + Details
Name: | omer_MaximumRoyaltyPayablePercentage
Namespace Prefix: | omer_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of non cash contractual interest expense which was added to the outstanding principal balance of the OMIDRIA royalty obligation. + References No definition available. + Details
Name: | omer_NonCashContractualInterestExpenseOnRoyaltyObligation
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of cash inflow from royalty obligation. + References No definition available. + Details
Name: | omer_ProceedsFromRoyaltyObligation
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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