v3.26.1
Cover
 6 Months Ended
Jun. 30, 2026
Document Information [Line Items]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Jun. 30, 2026
Document Transition Report false
Entity File Number 001-35890
Entity Registrant Name Tempest Therapeutics, Inc.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 45-1472564
Entity Address, Address Line One 2000 Sierra Point Parkway
Entity Address, Address Line Two Suite 400
Entity Address, City or Town Brisbane
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94005
City Area Code (415)
Local Phone Number 798-8589
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
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2026
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Central Index Key 0001544227
Common Stock  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.001 par value
Trading Symbol TPST
Security Exchange Name NASDAQ
Series A Junior Participating Preferred Purchase Rights  
Document Information [Line Items]  
Title of 12(b) Security Series A Junior Participating Preferred Purchase Rights
No Trading Symbol Flag true
Security Exchange Name NASDAQ