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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 08, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Registrant Name Terns Pharmaceuticals, Inc.    
Entity Central Index Key 0001831363    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
ICFR Auditor Attestation Flag false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Small Business true    
Entity Common Stock, Shares Outstanding   64,651,693  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Shell Company false    
Entity File Number 001-39926    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 98-1448275    
Entity Address Address Line1 1065 East Hillsdale Blvd.    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Foster City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94404    
City Area Code 650    
Local Phone Number 525-5535    
Entity Public Float     $ 408,999,623
Document Transition Report false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol TERN    
Security Exchange Name NASDAQ    
Documents Incorporated By Reference

Portions of the information called for by Part III of this Annual Report on Form 10-K is hereby incorporated by reference from the definitive proxy statement for the registrant’s 2024 annual meeting of stockholders, which will be filed with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year ended December 31, 2023.

    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 42    
Auditor Location San Jose, California    
Auditor Name Ernst & Young LLP