v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-40440  
Entity Registrant Name Senti Biosciences, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 86-2437900  
Entity Address, Address Line One 2 Corporate Drive, First Floor  
Entity Address, City or Town South San Francisco  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94080  
City Area Code (650)  
Local Phone Number 239-2030  
Title of 12(b) Security Common stock, par value $0.0001 per share  
Trading Symbol SNTI  
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 true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   26,160,206
Entity Central Index Key 0001854270  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false