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Fair Value of Financial Assets and Liabilities | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value of Financial Assets and Liabilities | # 4. Fair Value of Financial Assets and Liabilities The carrying amounts reported in the condensed consolidated balance sheets for accounts receivable, inventory, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximate their fair value based on the short-term maturity of these instruments. The following table presents information about the Company’s RLNs, promissory note to Pfizer (the Promissory Note) and Exchangeable Notes and indicates the fair value hierarchy of the valuation inputs utilized to determine the approximate fair value:
September 30, 2025 |  | Book |  |  | Approximate |  |  |  |  |  |  |  |  |  |
Current Liabilities |  | Value |  |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Royalty-linked notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term royalty-linked notes |  | $ | 281 |  |  | $ | 281 |  |  | $ | — |  |  | $ | — |  |  | $ | 281 |
Total current liabilities |  | $ | 281 |  |  | $ | 281 |  |  | $ | — |  |  | $ | — |  |  | $ | 281 |
Long-term Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term promissory note |  | $ | 21,215 |  |  | $ | 21,619 |  |  | $ | — |  |  | $ | 21,619 |  |  | $ | — |
Revenue Futures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty-linked notes |  |  | 12,239 |  |  |  | 12,239 |  |  |  | — |  |  |  | — |  |  |  | 12,239 |
Total long-term liabilities |  | $ | 33,454 |  |  | $ | 33,858 |  |  | $ |  |  |  | $ | 21,619 |  |  | $ | 12,239 |
December 31, 2024 |  | Book |  |  | Approximate |  |  |  |  |  |  |  |  |  |
Current Liabilities |  | Value |  |  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Exchangeable Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term exchangeable notes |  | $ | 14,463 |  |  | $ | 14,444 |  |  | $ | — |  |  | $ | 14,444 |  |  | $ | — |
Total current liabilities |  | $ | 14,463 |  |  | $ | 14,444 |  |  | $ | — |  |  | $ | 14,444 |  |  | $ | — |
Long-term Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Promissory Note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term promissory note |  | $ | 20,300 |  |  | $ | 20,412 |  |  | $ | — |  |  | $ | 20,412 |  |  | $ | — |
Revenue Futures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty-linked notes |  |  | 10,771 |  |  |  | 10,771 |  |  |  | — |  |  |  | — |  |  |  | 10,771 |
Total long-term liabilities |  | $ | 31,071 |  |  | $ | 31,183 |  |  | $ | — |  |  | $ | 20,412 |  |  | $ | 10,771 |
The fair value of the Promissory Note was determined using DCF analysis using the effective interest rate calculated following the modification of the original license agreement with Pfizer for the worldwide exclusive rights to research, develop, manufacture and commercialize sulopenem (Pfizer License), which represents a Level 2 basis of fair value measurement (see Note 11 – Debt). The fair value of Exchangeable Notes was determined using DCF analysis using the fixed interest rate outlined in the indenture governing the Exchangeable Notes (Exchangeable Notes Indenture), without consideration of transaction costs, which represents a Level 2 basis of fair value measurement. The Level 3 liabilities held as of September 30, 2025 consist of a separate financial instrument that was issued as part of the Units, the RLNs (see Note 12 – Royalty-Linked Notes). At any time on or after January 21, 2021 through January 31, 2025, subject to specified limitations, the Exchangeable Notes were exchangeable for the Company’s ordinary shares, cash or a combination of ordinary shares and cash. Beginning on January 21, 2021 to January 31, 2025, certain noteholders of $40,691 aggregate principal amount of Exchangeable Notes completed a non-cash exchange of their notes for an aggregate of 3,760,155 of the Company’s ordinary shares, which in cluded accrued and unpaid interest relating to such notes. On January 31, 2025, the Exchangeable Notes matured and Iterum Bermuda repaid to the holders thereof an aggregate principal amount of $11,117 together with accrued interest of $3,628. The RLN liability is carried at fair value on the condensed consolidated balance sheet (see Note 12 – Royalty-Linked Notes). The total fair value of $12,520 was determined using DCF analysis, without consideration of transaction costs, which represents a Level 3 basis of fair value measurement. The key inputs to valuing the RLNs were the terms of the indenture governing the RLNs (the RLN Indenture), the expected cash flows to be received by holders of the RLNs based on management’s revenue forecasts of U.S. sulopenem sales and a risk-adjusted discount rate to derive the net present value of expected cash flows. The RLNs will be subject to a maximum return amount, including all principal and payments and certain default interest in respect of uncurable defaults, of $160.00 (or 4,000 times the principal amount of such note). The discount rate applied to the model was 22%. Fair value measurements are highly sensitive to changes in these inputs and significant changes in these inputs could result in a significantly higher or lower fair value.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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