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Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Feb. 22, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol BEAM    
Entity Registrant Name Beam Therapeutics Inc.    
Entity Central Index Key 0001745999    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   72,397,631  
Entity Public Float     $ 2,460
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Small Business false    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NASDAQ    
Entity File Number 001-39208    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-5238376    
Entity Address, Address Line One 238 Main Street    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02142    
City Area Code 857    
Local Phone Number 327-8775    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Registrant incorporates by reference into Part III (Items 10, 11, 12, 13 and 14) of this Annual Report on Form 10-K portions of the Registrant’s definitive Proxy Statement for the 2023 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A.

   
Auditor Name Deloitte & Touche LLP    
Auditor Firm ID 34    
Auditor Location Boston, Massachusetts