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INTANGIBLE ASSET AND GOODWILL - Intangible Assets (Details) - Developed product rights for Auryxia - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 214,705  
Accumulated Amortization (205,694)  
Net Book Value $ 9,011 $ 36,042
Estimated Useful Life 6 years