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Intangible assets and goodwill (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets The following table summarizes the Company's finite-lived intangible assets:
Weighted Average Useful Life in YearsSeptember 30, 2023December 31, 2022
Gross Carrying AmountAccumulated Amortization
Net Carrying Amount (1)
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Products (2)
13.5$855.4 $272.6 $582.8 $982.1 $253.3 $728.8 
Customer relationships0.028.6 28.6 — 28.6 28.6 — 
CDMO0.05.5 5.5 — 5.5 5.5 — 
Total intangible assets$889.5 $306.7 $582.8 $1,016.2 $287.4 $728.8 
(1) During the nine months ended September 30, 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 three months ended September 30, 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:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Amortization expense$16.3 $14.0 $49.4 $42.0 
Schedule of Goodwill
The table below summarizes the changes in the carrying amount of goodwill by reportable segment:
Products (1)
Services (2)
Total
Balance at December 31, 2022$218.2 $— $218.2 
Goodwill impairment(218.2)— (218.2)
Balance at September 30, 2023$— $— $— 
(1) Amounts for the Company's Products segment include gross carrying values of $259.9 million as of September 30, 2023 and December 31, 2022 and accumulated impairment losses of $259.9 million.
(2) Amounts for the Company's Services segment include gross carrying values of $6.7 million as of September 30, 2023 and December 31, 2022, and accumulated impairment losses of $6.7 million.