Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Mar. 02, 2018
Jun. 30, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name FATE THERAPEUTICS INC    
Entity Central Index Key 0001434316    
Document Type 10-K    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Trading Symbol FATE    
Entity Public Float     $ 122,330,000
Entity Common Stock, Shares Outstanding   52,769,156  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY