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STOCK-BASED COMPENSATION AND EMPLOYEE RETIREMENT PLANS - Equity Plans (Details) - shares	Dec. 31, 2025	Jun. 10, 2025	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	18,152,258		16,684,325
Inducement Award Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	1,152,477
Keryx Equity Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	148,860		163,765
Additional awards authorized for grant (in shares)	0		0
Akebia Therapeutics, Inc. 2014 Incentive Plan, as amended (the 2014 Plan)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	8,412,898		11,559,708
Additional awards authorized for grant (in shares)	0		0
Akebia Therapeutics, Inc. 2014 Incentive Plan, as amended (the 2014 Plan) | Inducement Award Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	1,050,525		1,151,127
Akebia Therapeutics, Inc. 2023 Stock Incentive Plan (the 2023 Plan) (replaces 2014 Plan), as amended
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	15,913,729		10,390,642
Additional awards authorized for grant (in shares)	24,723,655		11,340,648
Akebia Therapeutics, Inc. 2023 Stock Incentive Plan (the 2023 Plan) (replaces 2014 Plan), as amended | Inducement Award Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional awards authorized for grant (in shares)		18,900,000
Number of options outstanding (in shares)	3,034,085		2,534,775

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