Intangible assets, net, consist 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):


September 30, 2022	Gross Carrying Value		Accumulated Amortization		Intangible Assets, Net		Weighted-Average Useful Lives
Developed technologies	$	590,000	$	(70,057)	$	519,943	10 years, 5 months
Customer relationships	90		(31)		59		10 years
Total finite-lived intangible assets, net	590,090		(70,088)		520,002
Acquired IPR&D	61,000		—		61,000
Total intangible assets, net	$	651,090	$	(70,088)	$	581,002

December 31, 2021	Gross Carrying Value		Accumulated Amortization		Intangible Assets, Net		Weighted-Average Useful Lives
Developed technologies	$	590,000	$	(27,097)	$	562,903	10 years, 5 months
Customer relationships	90		(25)		65		10 years
Total finite-lived intangible assets, net	590,090		(27,122)		562,968
Acquired IPR&D	61,000		—		61,000
Total intangible assets, net	$	651,090	$	(27,122)	$	623,968