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v3.19.3

Commitments and Contingencies (Details) $ in Millions | Sep. 30, 2019 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Contract termination fees | $ 22.6

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