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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
The Company considers its legal obligation to remediate its facilities upon a decommissioning of its radioactive-related operations as an asset retirement obligation. The Company has production facilities which manufacture and process radioactive materials at its North Billerica, Massachusetts and Somerset, New Jersey sites. As of December 31, 2021, the liability is measured at the present value of the obligation expected to be incurred, of approximately $26.4 million.
The Company previously operated a production facility which manufactured and processed radioactive materials at its San Juan, Puerto Rico site. As of December 31, 2020, the liability for the San Juan, Puerto Rico site was recorded in liabilities held for sale and the sale was consummated on January 29, 2021.
The following table provides a summary of the changes in the Company’s asset retirement obligations:

(in thousands)Amount
Balance, January 1, 2021$14,020 
Change in useful life estimate5,259 
Accretion expense1,554 
Balance, December 31, 2021$20,833 
In December 2021, the Company evaluated the accretion timeline of an asset group due to a revision in the planned period of use at the North Billerica site. As a result of the accelerated timeline, the Company determined the asset group’s present value exceeded the current value recorded as of December 31, 2021. Accordingly, the Company recorded a non-cash adjustment of $5.3 million to anticipate a revision in the end of useful life by the end of 2022.
The Company is required to provide the Massachusetts Department of Public Health and New Jersey Department of Environmental Protection financial assurance demonstrating the Company’s ability to fund the decommissioning of its North Billerica, Massachusetts and Somerset, New Jersey production facilities upon closure, although the Company has no current plans to close the facilities. The Company has provided this financial assurance in the form of a $28.2 million surety bond.