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401k Retirement Plan - Narrative (Details)	12 Months Ended
	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

X

- 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