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v3.20.4

401k Retirement Plan - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($)
401(k) Retirement Plan |
Maximum percent of each employee's contributions matched by employer | 4.00%
Maximum company match per employee | $ 4,000

X
- Definition Maximum amount the employer will match employee contribution of a defined contribution plan. + References No definition available. + Details
Name: | omer_DefinedContributionPlanMaximumEmployerMatchingContribution
Namespace Prefix: | omer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration