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INTANGIBLE ASSET AND GOODWILL
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
INTANGIBLE ASSET AND GOODWILL INTANGIBLE ASSET AND GOODWILL
Intangible Asset
Intangible asset, net of accumulated amortization, prior impairments and adjustments as of September 30, 2024 and December 31, 2023 consisted of the following (in thousands):  
 September 30, 2024December 31, 2023
Intangible asset:Gross Carrying
Value		Accumulated AmortizationNet Book ValueNet Book ValueEstimated Useful Life
Developed product rights for Auryxia$214,705 $(205,694)$9,011 $36,042 6 years
The Company recorded $9.0 million in amortization expense for each of the three months ended September 30, 2024 and 2023, and $27.0 million for each of the nine months ended September 30, 2024 and 2023 related to the developed product rights for Auryxia.
Goodwill
As of September 30, 2024 and December 31, 2023, the Company had goodwill of $59.0 million in connection with the December 2018 merger with Keryx. The Company has not i