XML 74 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Mar. 17, 2022
Jul. 20, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name ERASCA, INC.    
Entity Central Index Key 0001761918    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity File Number 001-40602    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 83-1217027    
Entity Address, Address Line One 10835 Road to the Cure    
Entity Address, Address Line Two Suite 140    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92121    
City Area Code 858    
Local Phone Number 465-6511    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   121,592,318  
Entity Public Float     $ 1.1
Title of 12(b) Security Common Stock, $0.0001 par value per share    
Trading Symbol ERAS    
Security Exchange Name NASDAQ    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Auditor Firm ID 185    
Auditor Name KPMG LLP    
Auditor Location San Diego, California    
Documents Incorporated by Reference [Text Block]

Certain sections of the Registrant’s definitive proxy statement for the 2022 annual meeting of stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Form 10-K are incorporated by reference into Part III of this Form 10-K.