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Significant Accounting Policies - Chargebacks and Returns (Details)	12 Months Ended
	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