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PRODUCT REVENUE AND RESERVES FOR VARIABLE CONSIDERATION - Product Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Total revenues $ 57,336 $ 32,607
Product revenue, net    
Disaggregation of Revenue [Line Items]    
Total revenues 55,791 31,009
Vafseo    
Disaggregation of Revenue [Line Items]    
Total revenues 12,034 0
Auryxia    
Disaggregation of Revenue [Line Items]    
Total revenues $ 43,757 $ 31,009