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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 10, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Entity Registrant Name IKENA ONCOLOGY, INC.    
Entity Central Index Key 0001835579    
Entity Incorporation, State or Country Code DE    
Entity File Number 001-40287    
Entity Tax Identification Number 81-1697316    
Entity Address, Address Line One 645 Summer Street    
Entity Address, Address Line Two Suite 101    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02210    
City Area Code 857    
Local Phone Number 273-8343    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Shell Company false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol IKNA    
Security Exchange Name NASDAQ    
Document Annual Report true    
Document Transition Report false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Common Stock, Shares Outstanding   36,108,995  
Entity Public Float     $ 296.7
Auditor Name Ernst & Young LLP    
Auditor Location Boston, Massachusetts    
Auditor Firm ID 42    
Documents Incorporated by Reference

Portions of the registrant’s proxy statement for the 2022 annual meeting of stockholders to be filed pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2021, are incorporated by reference in Part III of this Form 10-K.