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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 01, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Registrant Name PEPGEN INC.    
Entity Central Index Key 0001835597    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   32,354,495  
Entity Public Float     $ 97.7
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement relating to its 2024 Annual Meeting of Stockholders to be filed hereafter are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.

    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Title of 12(b) Security Common stock, par value $0.0001 per share    
Trading Symbol PEPG    
Security Exchange Name NASDAQ    
Entity File Number 001-41374    
Entity Tax Identification Number 85-3819886    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 321 Harrison Avenue    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02118    
City Area Code 781    
Local Phone Number 797-0979    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Auditor Firm ID 185    
Auditor Location Phoenix, AZ, USA    
Auditor Name KPMG LLP