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INVENTORIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483080/330-10-50-2 + Details
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- Details
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