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STOCK-BASED COMPENSATION AND BENEFIT PLAN - Narrative (Details) |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 06, 2019 USD ($) shares | Mar. 31, 2025 USD ($) installment shares | Mar. 31, 2024 USD ($) | Dec. 31, 2024 shares
Class of Stock [Line Items] |  |  |  |
Stock-based compensation expense | $ |  | $ 2,187,000 | $ 2,360,000 |
Granted (in shares) |  | 3,852,013 |  |
Number of options outstanding (in shares) |  | 19,102,010 |  | 16,684,325
Unrecognized compensation costs, options | $ |  | $ 13,200,000 |  |
Unrecognized compensation costs, options, period for recognition |  | 3 years 2 months 1 day |  |
2014 Employee Stock Purchase Plan |  |  |  |
Class of Stock [Line Items] |  |  |  |
Purchase price at the end of offering period | 85.00% |  |  |
Offering period | 6 months |  |  |
Maximum employee subscription rate | 15.00% |  |  |
Maximum employee subscription amount | $ | $ 25,000 |  |  |
Maximum number of shares per employee in any offering period | 1,500 |  |  |
Common stock, reserved for future issuance (in shares) |  | 4,354,707 |  | 4,448,069
Number of shares issued (in shares) |  | 93,362 |  |
Share-based Payment Arrangement, Option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Expiration period |  | 10 years |  |
Share-based Payment Arrangement, Option | Share-based Compensation Award, Tranche, First Anniversary of Grant Date |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 100.00% |  |
Share-based Payment Arrangement, Option | Share Based Compensation Award Tranche One |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Vesting percentage |  | 25.00% |  |
Share-based Payment Arrangement, Option | Share Based Compensation Award Tranche Two |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Number of equal quarterly installments | installment |  | 12 |  |
Share-based Payment Arrangement, Option | Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 12 months |  |
Share-based Payment Arrangement, Option | Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 48 months |  |
Stock appreciation rights |  |  |  |
Class of Stock [Line Items] |  |  |  |
Expiration period |  | 10 years |  |
Stock appreciation rights | Share-based Compensation Award, Tranche, First Anniversary of Grant Date |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 100.00% |  |
Stock appreciation rights | Share Based Compensation Award Tranche One |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Vesting percentage |  | 25.00% |  |
Stock appreciation rights | Share Based Compensation Award Tranche Two |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Number of equal quarterly installments | installment |  | 12 |  |
Stock appreciation rights | Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 12 months |  |
Stock appreciation rights | Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 48 months |  |
Inducement Award Program |  |  |  |
Class of Stock [Line Items] |  |  |  |
Granted (in shares) |  | 217,613 |  |
Number of options outstanding (in shares) |  | 211,088 |  |
Inducement Award Program | Akebia Therapeutics, Inc. 2023 Stock Incentive Plan (the 2023 Plan) (replaces 2014 Plan) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of options outstanding (in shares) |  | 2,274,138 |  | 2,534,775
Unvested RSUs | Share-based Compensation Award, Tranche, First Anniversary of Grant Date |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 100.00% |  |
Unvested RSUs | Share-Based Payment Arrangement, Tranche Two, Following First Anniversary After Grant Date |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting period |  | 2 years |  |
Vesting percentage |  | 66.67% |  |
Number of equal quarterly installments | installment |  | 8 |  |
Award vesting grace period |  | 1 year |  |
Unvested RSUs | Share-Based Payment Arrangement, Tranche One, First Anniversary After Grant Date, Subjected To Individual Continued Service |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 33.33% |  |
Unvested RSUs | Share-Based Payment Arrangement, Tranche Two, Second Anniversary After Grant Date, Subjected To Individual Continued Service |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 33.33% |  |
Unvested RSUs | Share-Based Payment Arrangement, Tranche Three, Third Anniversary After Grant Date, Subjected To Individual Continued Service |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 33.33% |  |
Unvested RSUs | Share-Based Payment Arrangement, Tranche One, First Anniversary After Grant Date |  |  |  |
Class of Stock [Line Items] |  |  |  |
Vesting percentage |  | 33.33% |  |
Restricted Stock Units (RSUs) And Performance Based Restricted Stock Units (PSUs) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Unrecognized compensation costs, options, period for recognition |  | 2 years 4 months 17 days |  |
Unrecognized compensation costs, stock | $ |  | $ 12,200,000 |  |
Director | Share-based Payment Arrangement, Option | Akebia Therapeutics, Inc. 2023 Stock Incentive Plan (the 2023 Plan) (replaces 2014 Plan) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Granted (in shares) |  | 3,634,400 |  |

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