v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 01, 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 001-40384  
Entity Registrant Name TOURMALINE BIO, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 83-2377352  
Entity Address, Address Line One 27 West 24th Street  
Entity Address, Address Line Two Suite 702  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10010  
City Area Code 646  
Local Phone Number 481-9832  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol TRML  
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   25,692,268
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001827506  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false