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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | 10. Asset Retirement Obligations The Company considers its legal obligation to remediate its facilities upon a potential decommissioning of its radioactive-related operations an asset retirement obligation (“ARO”). The Company has a production facility that manufactures and processes radioactive materials at its North Billerica, Massachusetts site. As of September 30, 2025, the ARO is measured at the present value of the expenses estimated to be incurred in such remediation, and is approximately $20.4 million. The following table provides a summary of the changes in the Company’s carrying value of its ARO:
(in thousands) |  | Amount |
Balance at January 1, 2025 |  | $ | 23,344 |
Revision of estimated decommissioning costs |  |  | (4,727 | )
Remediation costs |  |  | (1,079 | )
Reclassification to liabilities held-for-sale(1) |  |  | (17,771 | )
Accretion expense |  |  | 370 |
Balance at September 30, 2025 |  | $ | 137 |
(1) Amount reclassified to liabilities held for sale as a result of the pending sale of the assets and liabilities associated with the Company’s SPECT business. See Note 8, “Assets and Liabilities Held for Sale” for more information. In the first quarter of 2025, the Company revised certain inputs to its estimate of decommissioning costs expected to be incurred throughout the period of remediation, which reduced the estimate of remediation costs by $4.7 million. This reduction was primarily the result of changes in the technology and processes used for the remediation activities from those contemplated in the estimate previously provided in 2022, and was recorded in other income on the Company's condensed consolidated statements of operations in the first quarter of 2025. During the three months ended September 30, 2025, the Company recorded an additional reduction of $1.1 million to the ARO for remediation efforts completed during the period. The Company is required to provide the Massachusetts Department of Public Health financial assurance demonstrating the Company’s ability to fund any decommissioning of its North Billerica, Massachusetts production facility in the event of any closure. The Company has provided this financial assurance in the form of a $30.3 million surety bond.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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