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Cover Page - shares
 6 Months Ended
Jun. 30, 2021
Aug. 10, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
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 7000 Shoreline Court  
Entity Address, Address Line Two Suite 275  
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 798-8589  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol TPST  
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   6,703,242
Entity Central Index Key 0001544227  
Amendment Flag false