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Significant Accounting Policies - Discontinued Operations (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 29, 2022	Sep. 30, 2022	Dec. 23, 2021	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds upon entering into OMIDRIA royalty obligation				$ 125,000
OMIDRIA royalty obligation				125,126
DRI
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds upon entering into OMIDRIA royalty obligation		$ 125,000
OMIDRIA royalty obligation		$ 125,000
Effective interest rate		9.40%
Discontinued Operation | Omidria Assets Disposal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Milestone payment receivable	$ 200,000			$ 200,000
Percentage of royalty receivable	30.00%		50.00%
Percentage of interest earned on outstanding contract royalty asset	11.00%

X

- Definition

Represents maximum royalty payable percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Amount of milestone payment receivable form sale of royalty under asset purchase agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of interest earned on the outstanding contract royalty asset.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of royalty receivable on sale of product rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	omer_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash inflow from royalty obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of royalty liabilities classified as non-current.

+ References

No definition available.

+ Details

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Namespace Prefix:	omer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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