XML 16 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Mar. 15, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol IDYA    
Entity Registrant Name IDEAYA Biosciences, Inc.    
Entity Central Index Key 0001676725    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
Entity Common Stock, Shares Outstanding   32,259,988  
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Security Exchange Name NASDAQ    
Entity File Number 001-38915    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-4268251    
Entity Address, Address Line One 7000 Shoreline Court    
Entity Address, Address Line Two Suite 350    
Entity Address, City or Town South San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94080    
City Area Code 650    
Local Phone Number 443-6209    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 343.0
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement relating to the 2020 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. The proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2020.