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GOODWILL AND INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
Goodwill
The Company’s goodwill results from the acquisition of Pacira Pharmaceuticals, Inc. (the Company’s California operating subsidiary) from SkyePharma Holding, Inc. (now Vectura Group Limited, a subsidiary of Philip Morris International, Inc.) in 2007, the MyoScience Acquisition in 2019 and the Flexion Acquisition in 2021. The goodwill balance at each of June 30, 2024 and December 31, 2023 was $163.2 million.
Intangible Assets
Intangible assets, net, consists of the in-process research and development, or IPR&D, and developed technology from the Flexion Acquisition and developed technology and customer relationships from the MyoScience Acquisition and are summarized as follows (dollar amounts in thousands):
June 30, 2024Gross Carrying ValueAccumulated AmortizationIntangible Assets, NetWeighted-Average Useful Lives
Developed technologies$590,000 $(170,295)$419,705 10 years, 5 months
Customer relationships90 (47)43 10 years
     Total finite-lived intangible assets, net590,090 (170,342)419,748 
Acquired IPR&D34,866 — 34,866 
     Total intangible assets, net$624,956 $(170,342)$454,614 
December 31, 2023Gross Carrying ValueAccumulated AmortizationIntangible Assets, NetWeighted-Average Useful Lives
Developed technologies$590,000 $(141,655)$448,345 10 years, 5 months
Customer relationships90 (43)47 10 years
     Total finite-lived intangible assets, net590,090 (141,698)448,392 
Acquired IPR&D34,866 — 34,866 
     Total intangible assets, net$624,956 $(141,698)$483,258 
Amortization expense on intangible assets was $14.3 million for both the three months ended June 30, 2024 and 2023. Amortization expense on intangible assets was $28.6 million for both the six months ended June 30, 2024 and 2023.
Assuming no changes in the gross carrying amount of these intangible assets, the future estimated amortization expense on the finite-lived intangible assets will be $28.6 million for the remaining six months of 2024, $57.3 million each year from 2025 to 2030, $37.4 million in 2031, $7.9 million in 2032 and $2.2 million in 2033.