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Fair Value of Financial Instruments | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | 4. Fair Value of Financial Instruments Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In order to increase consistency and comparability of fair value measurements, financial instruments are categorized based on a hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three broad levels, which are described below: • Level 1 — Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. • Level 2 — Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.) and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). • Level 3 — Unobservable inputs that reflect the Company’s estimates about the assumptions that market participants would use in pricing the asset or liability. The Company develops these inputs based on the best information available, including its own data. The Company’s financial assets and liabilities that are measured at fair value on a recurring basis consist of money market funds, deferred compensation plan liabilities, contingent consideration liabilities and equity investments. The Company invests excess cash from its operating cash accounts in overnight investments and reflects these amounts in cash and cash equivalents in the condensed consolidated balance sheets at fair value using quoted prices in active markets for identical assets. The tables below present information about the Company’s assets and liabilities measured at fair value on a recurring basis:
|  |  |  |  | September 30, 2025 |
|  | Total Fair |  |  |  |  |  |  |  |  |  |
(in thousands) |  | Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 108,576 |  |  | $ | 108,576 |  |  | $ | — |  |  | $ | — |
Investment securities |  |  | 45,480 |  |  |  | 45,480 |  |  |  | — |  |  |  | — |
Total assets |  | $ | 154,056 |  |  | $ | 154,056 |  |  | $ | — |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liabilities |  | $ | 942 |  |  | $ | 942 |  |  | $ | — |  |  | $ | — |
Contingent consideration liabilities |  |  | 97,824 |  |  |  | — |  |  |  | — |  |  |  | 97,824 |
Total liabilities |  | $ | 98,766 |  |  | $ | 942 |  |  | $ | — |  |  | $ | 97,824 |
|  |  |  |  | December 31, 2024 |
|  | Total Fair |  |  |  |  |  |  |  |  |  |
(in thousands) |  | Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 682,209 |  |  | $ | 682,209 |  |  | $ | — |  |  | $ | — |
Investment securities |  |  | 39,489 |  |  |  | 39,489 |  |  |  | — |  |  |  | — |
Total assets |  | $ | 721,698 |  |  | $ | 721,698 |  |  | $ | — |  |  | $ | — |
Nonqualified Deferred Compensation Plan The Company maintains the Lantheus Nonqualified Deferred Compensation Plan (the “LDCP”) for the benefit of certain key, highly-compensated employees and non-employee directors. The assets of the LDCP are invested in corporate-owned life insurance (“COLI”) and mutual funds at September 30, 2025. The mutual funds are classified as Level 1 of the fair value hierarchy because they are valued using quoted market prices. There were no assets or liabilities balances in the LDCP at December 31, 2024. The liabilities of the LDCP are presented in other long-term liabilities in the Company’s condensed consolidated balance sheets. See Note 17, “Benefit Plans” for more information on the LDCP. Perspective Therapeutics Inc. Equity Securities At September 30, 2025, the Company held 11,677,339 shares of Perspective common stock (“Perspective Shares”). The Company accounts for its investment in Perspective Shares as an equity investment with a readily determinable fair value, as the securities are publicly traded on the New York Stock Exchange (“NYSE”). The fair value of the Perspective Shares is based on its closing price on the NYSE at the end of the fiscal period and is classified within Level 1 of the fair value hierarchy because the equity securities are valued using quoted market prices. The fair value of the Perspective Shares as of September 30, 2025 was approximately $40.1 million based on a closing market price of $3.43 per share on September 30, 2025, resulting in an unrealized loss of $0.1 million and an unrealized gain of $2.8 million for the three and nine months ended September 30, 2025, respectively. See Note 18, “Acquisitions” for further discussion of the Perspective transaction. Radiopharm Theranostics Limited Equity Securities The Company held 149,625,180 shares of Radiopharm common stock (“Radiopharm Shares”) as of December 31, 2024. In January 2025, the Company purchased via private placement, an additional 133,333,333 Radiopharm Shares for $5.0 million. At September 30, 2025, the Company held 282,958,513 Radiopharm Shares. The Company accounts for its investment in Radiopharm Shares as an equity investment with a readily determinable fair value, as the securities are publicly traded on the Australian Stock Exchange (“ASX”). The fair value of the Radiopharm Shares is based on the closing price on the ASX at the end of the fiscal period and is classified within Level 1 of the fair value hierarchy because the equity securities are valued using quoted market prices. The fair value of the Radiopharm Shares as of September 30, 2025 was approximately $5.4 million based on the converted closing market price of approximately $0.02 per share on September 30, 2025, resulting in an unrealized gain on equity securities of $1.2 million and an unrealized loss on equity securities of $2.0 million for the three and nine months ended September 30, 2025, respectively. See Note 18, “Acquisitions” for further discussion of the Radiopharm transaction. Contingent Consideration Progenics The Company assumed contingent consideration liabilities related to a previous acquisition completed by Progenics in 2013 (“2013 Acquisition”). These contingent consideration liabilities include potential payments of up to $70.0 million if the Company attains certain net sales targets primarily for AZEDRA and 1095 (also known as 131 I-MIP-1095) and a $5.0 million 1095 commercialization milestone. Additionally, there is a potential payment of up to $10.0 million for a commercialization milestone related to a prostate cancer product candidate the Company refers to as “1404” that was out-licensed to ROTOP Pharmaka GmbH. The Company’s total potential payments related to the 2013 Acquisition are approximately $85.0 million. The Company considers the contingent consideration liabilities relating to the 2013 Acquisition each a Level 3 instrument (one with significant unobservable inputs) in the fair value hierarchy. The estimated fair value of these was determined based on probability adjusted discounted cash flows and Monte Carlo simulation models that included significant estimates and assumptions pertaining to commercialization events and sales targets. The most significant unobservable inputs with respect to 1095 and 1404 are the probabilities of achieving regulatory approval of those development projects and subsequent commercial success. Significant changes in any of the probabilities of success, the probabilities as to the periods in which sales targets and milestones will be achieved, discount rates or underlying revenue forecasts would result in a higher fair value measurement. The Company records the contingent consideration liabilities at fair value with changes in estimated fair values recorded in general and administrative expenses in the condensed consolidated statements of operations. The Company can give no assurance that the actual amounts paid, if any, in connection with the contingent consideration liabilities, will be consistent with any recurring fair value estimate of such contingent consideration liabilities. The Company estimated that the probability of successfully meeting the sales targets and commercialization milestones described above was zero, as the Company discontinued the production of AZEDRA in the first quarter of 2024 and the Company is not actively advancing 1095. As a result of this assessment, the Company determined the value of the contingent consideration liabilities to be $0 at September 30, 2025 and December 31, 2024. Evergreen Theragnostics, Inc. Pursuant to the terms of the Agreement and Plan of Merger (the “Evergreen Merger Agreement”) with Evergreen and Shareholder Representative Services LLC governing the Company's acquisition of Evergreen in April 2025 (see Note 18, “Acquisitions”), the Company is required to pay up to $727.5 million in cash upon the achievement of specified milestones in connection with the development and commercialization of certain milestone products, as defined in the Evergreen Merger Agreement, and Octevy (also referred to as LNTH-2501), a registrational-stage positron emission tomography (“PET”) diagnostic imaging agent targeting neuroendocrine tumors. The Company records these possible payments as contingent consideration liabilities that are classified within Level 3 of the fair value hierarchy. The Company estimated the fair value of the contingent consideration liabilities associated with the sales milestones using a Monte Carlo simulation in a risk-neutral framework, whereby the achievement of the future revenue associated with the sales milestones was simulated using a geometric Brownian motion model. The Company estimated the fair value of the contingent consideration liability associated with the development and commercialization milestones using a probability-weighted discounted cash flow (“DCF”) approach. Life Molecular Imaging Ltd. Pursuant to the terms of the Sale and Purchase Agreement (the “LMI Purchase Agreement”) with Life Medical Group Limited (“Life Medical”) in connection with the Company’s acquisition of Life Molecular in July 2025 (see Note 18, “Acquisitions”), the Company is required to make certain earn-out and milestone payments as a percentage of and upon achievement of specified net sales thresholds, respectively, of Neuraceq and certain other imaging and tracing agents in Life Molecular’s pipeline. These contingent cash earn-out and milestone payments total up to $400.0 million. In addition to the net sales earn-out and milestone payments, the Company also assumed a contingent consideration liability owed to Piramal Holdings SA (“Piramal”), pursuant to an assumed contract (the “Piramal SPA”). The Company is required to make cash payments of up to $30.0 million upon the achievement of specified earnings metrics of Life Molecular, as defined in the Piramal SPA. The Company estimated the fair value of the contingent consideration liabilities using a Monte Carlo simulation model in a risk-neutral framework, whereby the achievement of the future revenue and other specified earnings metrics associated with the contingent payments were simulated using a geometric Brownian motion model. The following table reflects the activity for the Company’s contingent consideration measured at fair value using Level 3 inputs for the nine months ended September 30, 2025:
|  | Level 3 |
|  | Accrued Contingent |
(in thousands) |  | Consideration |
Balance December 31, 2024 |  | $ | — |
Evergreen acquisition |  |  | 43,042 |
Life Molecular acquisition |  |  | 53,800 |
Changes in fair value included in net income |  |  | 982 |
Balance September 30, 2025 |  | $ | 97,824 |
Significant changes in any of the probabilities of success, the probabilities as to the periods in which sales targets and milestones will be achieved, discount rates or underlying revenue forecasts would result in a higher or lower fair value measurement. The Company records the contingent consideration liabilities at fair value with changes in estimated fair values recorded within operating expenses in the condensed consolidated statements of operations. The Company can give no assurance that the actual amounts paid, if any, in connection with the contingent consideration liabilities, will be consistent with any recurring fair value estimate of such contingent consideration liabilities. As a result of this assessment, the Company determined the value of the contingent consideration liabilities to be $97.8 million at September 30, 2025. The recurring Level 3 fair value measurements of the Company's contingent consideration liabilities include the following significant unobservable inputs (in thousands, except percent data):
|  | Fair Value at |  |  |  |  |  |  |  |  |
Contingent Consideration Liability |  | September 30, 2025 |  |  | Valuation Technique |  | Unobservable Inputs |  | Range |  | Weighted Average
Development and commercialization milestones |  |  | 40,965 |  |  | Discounted cash flow |  | Payment discount rate |  | 8.1% - 13.3% |  | 8.3%
|  |  |  |  |  |  | Probability of payment |  | 0.0% - 100.0% |  | 87.3%
|  |  |  |  |  |  | Range of expected payment dates |  | 2026 - 2037 |  | N/A
Sales milestones |  |  | 30,059 |  |  | Scenario analysis |  | Revenue volatility |  | 37.0% - 48.0% |  | 46.9%
|  |  |  |  |  |  | Revenue discount rate |  | 9.4% - 19.3% |  | 17.8%
Assumed contingent consideration from Piramal SPA |  |  | 26,800 |  |  | Scenario analysis |  | EBITDA volatility |  | 60.0% |  | 60.0%
|  |  |  |  |  |  | EBITDA discount rate |  | 21.4% - 22.0% |  | 21.4%
Total contingent consideration liabilities |  | $ | 97,824 |  |  |  |  |  |  |  |  |

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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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