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INVENTORIES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Inventory [Line Items]      
Write-down of inventory $ 2,505 $ 4,208 $ 1,580
Benefit in cost of goods sold related to previously written down as excess inventory   12,300 4,300
Auryxia Drug Substance      
Inventory [Line Items]      
Write-down of inventory $ 2,500 $ 4,200 $ 1,600