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Intangible assets and goodwill (Tables)
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
The Company's intangible assets consist of products acquired via business combinations or asset acquisitions. Components of the Company’s intangible assets, excluding goodwill, consists of the following:
December 31, 2023
December 31, 2022
Weighted Average Useful Life in YearsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Products (1)(2)
13.6$855.4 $288.8 $566.6 $982.1 $253.3 $728.8 
Customer relationships0.028.6 28.6 — 28.6 28.6 — 
Bioservices0.05.5 5.5 — 5.5 5.5 — 
Total intangible assets13.5$889.5 $322.9 $566.6 $1,016.2 $287.4 $728.8 
(1) During the year ended December 31, 2023, the Company sold $102.9 million of intangible assets, net as part of the sale of its travel health business to Bavarian Nordic. See Note 3, "Divestiture" for more information on the sale of the travel health business.
(2) During the year ended December 31, 2023, the Company recorded a $6.3 million intangible asset addition related to the contingent consideration payment to Ridgeback for the award of a 10-year contract by the Biomedical Advanced Research and Development Authority for advanced development, manufacturing scale-up, and procurement of EbangaTM treatment for Ebola. The related intangible asset was acquired through an asset acquisition that was completed in 2022.
Schedule of Finite-lived Intangible Assets Amortization Expense
Amortization expense associated with the Company's intangible assets was recorded as follows:
Year Ended December 31,
202320222021
Amortization expense65.6 59.9 58.5
Summary of Future Amortization Expense
The Company estimates our future amortization expense for our intangible assets as follows:
Year As of
December 31, 2023
2024$65.1 
202565.1 
202663.9 
202760.6 
202851.7 
Thereafter260.2 
Total remaining amortization$566.6 
Summary of Goodwill
The table below summarizes the changes in the carrying amount of goodwill by reportable segment:

Commercial Products (1)
MCM Products (2)
Services (3)
Total
Balance at December 31, 2021$— $218.2 $6.7 $224.9 
Goodwill impairment— — (6.7)(6.7)
Balance at December 31, 2022$— $218.2 $— $218.2 
Goodwill impairment— (218.2)— (218.2)
Balance at December 31, 2023$— $— $— $— 
(1) Amounts for the Company's Commercial Products segment include gross carrying values of $41.7 million as of December 31, 2023, 2022 and 2021, and accumulated impairment losses of $41.7 million as of December 31, 2023, 2022 and 2021.
(2) Amounts for the Company's MCM Products segment include gross carrying values of $218.2 million as of December 31, 2023, 2022 and 2021, and accumulated impairment losses of $218.2 million as of December 31, 2023.
(3) Amounts for the Company's Services segment include gross carrying values of $6.7 million as of December 31, 2023, 2022, and 2021, and accumulated impairment losses of $6.7 million as of December 31, 2023 and 2022.