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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
On May 24, 2022, we acquired all outstanding equity interests of Antares. A goodwill balance of $409.0 million was recognized for the excess of the consideration transferred over the net assets acquired and represents the expected revenue and cost synergies of the combined company and assembled workforce.
A summary of the activity impacting goodwill is presented below (in thousands):
Balance as of December 31, 2022$409,049 
Measurement period adjustment7,174 
Balance as of March 31, 2023
$416,223 
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, 2023 (in thousands).
Weighted average useful life (in years)
Gross Carrying ValueAccumulated AmortizationNet Carrying Value
Auto injector technology platform7$402,000 $49,092 $352,908 
XYOSTED proprietary product10136,200 11,643 124,557 
TLANDO product rights102,900 248 2,652 
Total finite-lived intangibles, net$541,100 $60,983 $480,117 
ATRS-1902 (IPR&D)Indefinite48,700 
Total intangibles, net$528,817 

The 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 2023$53,504 
202471,339 
202571,339 
202671,339 
202771,339 
Thereafter141,257 
Total$480,117