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

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.