Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name FATE THERAPEUTICS INC  
Entity Central Index Key 0001434316  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Trading Symbol FATE  
Entity Common Stock, Shares Outstanding   65,385,990
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-36076  
Entity Tax Identification Number 651311552  
Entity Address, Address Line One 3535 General Atomics Court  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town San Diego  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92121  
City Area Code 858  
Local Phone Number 875-1800