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v3.20.4

Significant Accounting Policies - Chargebacks and Returns (Details) | 12 Months Ended
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Dec. 31, 2020
Significant Accounting Policies |
Period chargebacks are generally settled | 28 days
Period for product return past its expiration or damaged | 12 months

X
- Definition Represents the maximum period in which product is allowed for return past its expiration or if its damaged. + References No definition available. + Details
Name: | omer_MaximumPeriodProductAllowedForReturn
Namespace Prefix: | omer_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period chargebacks are generally settled. + References No definition available. + Details
Name: | omer_PeriodChargebacksAreSettled
Namespace Prefix: | omer_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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