| Cover | Sep. 26, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 26, 2023 |
| Entity Registrant Name | AKEBIA THERAPEUTICS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36352 |
| Entity Tax Identification Number | 20-8756903 |
| Entity Address, Address Line One | 245 First Street |
| Entity Address, City or Town | Cambridge |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02142 |
| City Area Code | 617 |
| Local Phone Number | 871-2098 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.00001 per share |
| Trading Symbol | AKBA |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001517022 |
| Amendment Flag | false |
| Entity Listings [Line Items] | |
| Security Exchange Name | NASDAQ |
