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Document and Entity Information
Mar. 15, 2024
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001835597
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Mar. 15, 2024
Entity Registrant Name PepGen Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-41374
Entity Tax Identification Number 85-3819886
Entity Address, Address Line One 321 Harrison Avenue 8th Floor
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $0.0001 per share
Trading Symbol PEPG
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false