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: |