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INVENTORIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Inventory [Line Items]    
Write-down of inventory $ 163 $ 590
Benefit in cost of goods sold related to previously written down as excess inventory   3,700
Auryxia Drug Substance    
Inventory [Line Items]    
Write-down of inventory $ 200 $ 600