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INTANGIBLE ASSET AND GOODWILL (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible asset, net of accumulated amortization, prior impairments and adjustments as of September 30, 2023 and December 31, 2022 consisted of the following (in thousands):  
 September 30, 2023December 31, 2022
Intangible asset:Gross Carrying
Value		Accumulated AmortizationNet Book ValueNet Book ValueEstimated Useful Life
Developed product rights for Auryxia$214,705 $(169,652)$45,053 $72,084 6 years