v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Entity Registrant Name CARGO Therapeutics, Inc.  
Document Period End Date Jun. 30, 2025  
Entity Central Index Key 0001966494  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity File Number 001-41859  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-4080422  
Entity Address, Address Line One 835 Industrial Road  
Entity Address, Address Line Two Suite 400  
Entity Address, City or Town San Carlos  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94070  
City Area Code 650  
Local Phone Number 499-8950  
Title of 12(b) Security Common stock, par value $0.001 per share  
Trading Symbol CRGX  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   48,364,311