XML 42 R28.htm IDEA: XBRL DOCUMENT v3.22.4

Unsecured Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2022

Debt Instrument [Line Items]

Summary of unsecured convertible senior notes outstanding

​

​	​	​	​	​	​	​	​	​	​
​	​	Balance as of December 31, 2022
​		2023 Notes			2026 Notes			Total
​	​	(In thousands)
Principal amount	​	$	95,000	​	$	225,030	​	$	320,030
Unamortized debt issuance costs	​		(619)	​		(4,124)	​		(4,743)
Total unsecured convertible senior notes, net	​	$	94,381	​	$	220,906	​	$	315,287
​	​	​	​	​	​	​	​	​	​
Fair value of outstanding unsecured convertible senior notes (1)	​	$	92,031	​	$	118,141	​	​	​

​

​	​	​	​	​	​	​	​	​	​
​	​	Balance as of December 31, 2021
​		2023 Notes			2026 Notes			Total
​	​	(In thousands)
Principal amount	​	$	95,000	​	$	225,030	​	$	320,030
Unamortized discount	​		(1,282)	​		(5,290)	​		(6,572)
Total unsecured convertible senior notes, net	​	$	93,718	​	$	219,740	​	$	313,458
​	​	​	​	​	​	​	​	​	​
Fair value of outstanding unsecured convertible senior notes (1)	​	$	87,163	​	$	171,867	​	​	​

(1) The fair value is classified as Level 3 due to the limited trading activity for the unsecured convertible senior notes.

Schedule of future minimum payments of debt

​

​	​	​	​
2023		$	95,000
2024		​	—
2025		​	—
2026		​	225,030
Total future minimum principal payments under the 2023 Notes and 2026 Notes		$	320,030

2023 Unsecured Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of total interest expense recognized

​

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​	​	2022			2021			2020
​	​	(In thousands)
Contractual interest expense	​	$	5,938	​	$	5,938	​	$	10,410
Amortization of debt issuance costs	​		663	​		618	​		669
Amortization of debt discount	​		—	​		—	​		7,728
Total	​	$	6,601	​	$	6,556	​	$	18,807

​

2026 Unsecured Convertible Senior Notes

Debt Instrument [Line Items]

Schedule of total interest expense recognized

​

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​	​	2022		​	2021		​	2020
​	​	(In thousands)
Contractual interest expense	​	$	11,814	​	$	11,814	​	$	4,397
Amortization of debt issuance costs	​		1,167	​		1,078	​		230
Amortization of debt discount	​		—	​		—	​		3,022
Total	​	$	12,981	​	$	12,892	​	$	7,649

​

X

- Definition

Tabular disclosure of interest expense recognized relating to debt instrument.

+ References

No definition available.

+ Details

Name:	omer_ScheduleOfDebtInstrumentInterestExpenseRecognizedTableTextBlock
Namespace Prefix:	omer_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount.

+ References

No definition available.

+ Details

Name:	us-gaap_ConvertibleDebtTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of maturity and sinking fund requirement for long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

+ Details

Name:	us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=omer_ConvertibleSeniorNotes2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=omer_ConvertibleSeniorNotes2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: