v3.25.4
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 05, 2026
Jun. 30, 2025
Document information        
Document Type 10-K      
Document Annual Report true      
Document Period End Date Dec. 31, 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 Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
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      
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Entity Shell Company false      
Entity Public Float       $ 228.4
Entity Central Index Key 0001400118      
Current Fiscal Year End Date --12-31      
Document Fiscal Period Focus FY      
Amendment Flag false      
Auditor Name KPMG LLP Deloitte & Touche LLP    
Auditor Location Philadelphia, Pennsylvania San Francisco, California    
Auditor Firm ID 185 34    
Series A Common Stock        
Document information        
Entity Common Stock, Shares Outstanding     32,017,613  
Series B Common Stock        
Document information        
Entity Common Stock, Shares Outstanding     567,494