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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
A summary of the activity impacting goodwill is presented below (in thousands):
Balance as of December 31, 2023
$416,821 
Adjustment
— 
Balance as of March 31, 2024
$416,821 
Intangible Assets
Our acquired intangible assets are amortized using the straight-line method over their estimated useful lives of seven to ten years. The following table shows the cost, accumulated amortization and weighted average useful life in years for our acquired intangible assets as of March 31, 2024 (in thousands).
Weighted Average Useful Life (in years)
Gross Carrying ValueAccumulated AmortizationNet Carrying Value
Auto Injector technology platform7$402,000 $106,521 $295,479 
XYOSTED proprietary product10136,200 25,263 110,937 
Total finite-lived intangibles, net
$538,200 $131,784 $406,416 
ATRS-1902 (IPR&D)Indefinite48,700 
Total intangibles, net$455,116 
Estimated future annual amortization of finite-lived intangible assets is shown in the following table (in thousands). Actual amortization expense to be reported in future periods could differ from these estimates as a result of acquisitions, divestitures, and asset impairments, among other factors.

YearAmortization Expense
Remainder of 2024$53,286 
202571,049 
202671,049 
202771,049 
202871,049 
Thereafter68,934 
Total$406,416