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v3.20.4

Commitments and Contingencies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
Commitments and Contingencies. |
Contract termination fees | $ 32.0
Payment of technology access fees | $ 5.5

X
- Definition Long-Term Purchase Commitment, Termination Fee + References No definition available. + Details
Name: | omer_LongTermPurchaseCommitmentTerminationFee
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of payment of technology access fee during the reporting period. + References No definition available. + Details
Name: | omer_PaymentOfTechnologyAccessFees
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration