Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Grace Period

No definition available.

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- Definition

Share-Based Compensation Arrangement By Share-based Payment Award, Maximum Employee Subscription Amount

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- Definition

Share-based compensation arrangement by share-based payment award, offering period.

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Share-based compensation arrangement by share-based payment award, periodic vesting, number of installments.

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No definition available.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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STOCK-BASED COMPENSATION PLANS - Narrative (Details) $ in Thousands		3 Months Ended
	Jun. 06, 2019 USD ($) shares	Mar. 31, 2026 USD ($) installment shares	Mar. 31, 2025 USD ($)	Dec. 31, 2025 shares
Class of Stock [Line Items]
Stock-based compensation expense \| $		$ 3,668	$ 2,187
Granted (in shares)		4,869,975
Number of options outstanding (in shares)		21,871,531		18,152,258
Unrecognized compensation costs, options \| $		$ 14,400
Unrecognized compensation costs, options, period for recognition (in years)		2 years 11 months 15 days
2014 Employee Stock Purchase Plan
Class of Stock [Line Items]
Purchase price at the end of offering period	85.00%
Offering period (in months)	6 months
Maximum employee subscription rate (as percent)	15.00%
Maximum employee subscription amount \| $	$ 25
Maximum number of shares per employee in any offering period (in shares)	1,500
Common stock, reserved for future issuance (in shares)		4,164,300		4,260,647
Number of shares issued (in shares)		96,347
Share-based Payment Arrangement, Option
Class of Stock [Line Items]
Expiration period (in years)		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
SARs
Class of Stock [Line Items]
Expiration period (in years)		10 years
SARs \| Share-based Compensation Award, Tranche, First Anniversary of Grant Date
Class of Stock [Line Items]
Vesting percentage		100.00%
SARs \| Share Based Compensation Award Tranche One
Class of Stock [Line Items]
Vesting period		1 year
Vesting percentage		25.00%
SARs \| Share Based Compensation Award Tranche Two
Class of Stock [Line Items]
Vesting period		1 year
Number of equal quarterly installments \| installment		12
SARs \| Minimum
Class of Stock [Line Items]
Vesting period		12 months
SARs \| Maximum
Class of Stock [Line Items]
Vesting period		48 months
Inducement Award Program
Class of Stock [Line Items]
Granted (in shares)		858,775
Number of options outstanding (in shares)		858,775
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)		3,787,674		3,034,085
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 Compensation Award Tranche One
Class of Stock [Line Items]
Vesting percentage		50.00%
Unvested RSUs \| Share Based Compensation Award Tranche Two
Class of Stock [Line Items]
Vesting period		6 months
Vesting percentage		25.00%
Award vesting grace period (in years)		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%
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 (in years)		1 year
Restricted Stock Units (RSUs) And Performance Based Restricted Stock Units (PSUs)
Class of Stock [Line Items]
Unrecognized compensation costs, options, period for recognition (in years)		2 years 2 months 8 days
Unrecognized compensation costs, stock \| $		$ 12,700
Employees \| 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)		4,011,200