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Document and Entity Information - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 20, 2026
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Trading Symbol KYMR  
Entity Registrant Name KYMERA THERAPEUTICS, INC.  
Entity Central Index Key 0001815442  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   81,642,394
Entity Public Float $ 2,294.8  
Document Financial Statement Error Correction [Flag] false  
Entity Shell Company false  
Entity File Number 001-39460  
Entity Tax Identification Number 81-2992166  
Entity Address, Address Line One 500 North Beacon Street  
Entity Address, Address Line Two 4th Floor  
Entity Address, City or Town Watertown  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02472  
City Area Code 857  
Local Phone Number 285-5300  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code DE  
Document Annual Report true  
Document Transition Report false  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Security Exchange Name NASDAQ  
Documents Incorporated by Reference

Portions of the registrant’s Proxy Statement for its 2026 Annual Meeting of Stockholders, which the registrant intends to file with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year ended December 31, 2025, are incorporated by reference into Part III of this Annual Report on Form 10-K

  
ICFR Auditor Attestation Flag true  
Entity Listing, Par Value Per Share $ 0.0001  
Auditor Name Ernst & Young LLP  
Auditor Location Boston, Massachusetts  
Auditor Firm ID 42  
Auditor Opinion [Text Block]

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 26, 2026 expressed an unqualified opinion thereon.