v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 05, 2025
Document information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Transition Report false  
Securities Act File Number 001-41742  
Entity Registrant Name Sagimet Biosciences Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-5991472  
Entity Address, Address Line One 155 Bovet Road  
Entity Address, Address Line Two Suite 303  
Entity Address, City or Town San Mateo  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94402  
City Area Code 650  
Local Phone Number 561-8600  
Title of 12(b) Security Series A Common Stock,$0.0001 par value per share  
Trading Symbol SGMT  
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 Central Index Key 0001400118  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Series A Common Stock    
Document information    
Entity Common Stock, Shares Outstanding   31,001,109
Series B Common Stock    
Document information    
Entity Common Stock, Shares Outstanding   1,520,490