v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2014
Feb. 28, 2015
Jun. 30, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol AKBA    
Entity Registrant Name Akebia Therapeutics, Inc.    
Entity Central Index Key 0001517022    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   20,370,624  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 546,323,693