v3.26.1
COVER - shares
 3 Months Ended
Mar. 31, 2026
May 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-38890  
Entity Registrant Name Quince Therapeutics, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 90-1024039  
Entity Address, Address Line One 611 Gateway Boulevard,  
Entity Address, Address Line Two Suite 273  
Entity Address, City or Town South San Francisco,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94080  
City Area Code 415  
Local Phone Number 910-5717  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol QNCX  
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 false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   16,300,740
Entity Central Index Key 0001662774  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Current Fiscal Year End Date --12-31