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INTANGIBLE ASSET AND GOODWILL (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible asset, net of accumulated amortization, prior impairments and adjustments as of March 31, 2024 and December 31, 2023 consisted of the following (in thousands):  
 March 31, 2024December 31, 2023
Intangible asset:Gross Carrying
Value		Accumulated AmortizationNet Book ValueNet Book ValueEstimated Useful Life
Developed product rights for Auryxia$214,705 $(187,673)$27,032 $36,042 6 years