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INTANGIBLE ASSET AND GOODWILL - Intangible Assets (Details) - Developed product rights for Auryxia - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 214,705  
Accumulated Amortization (169,652)  
Net Book Value $ 45,053 $ 72,084
Estimated Useful Life 6 years