Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 05, 2023
Document Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2023
Entity File Number	001-40367
Entity Registrant Name	Vaccitech plc
Entity Incorporation, State or Country Code	X0
Entity Tax Identification Number	00-0000000
Entity Address, Country	GB
Entity Address, Address Line One	Unit 6-10, Zeus Building Rutherford Avenue
Entity Address, Address Line Two	Harwell
Entity Address, City or Town	Didcot
Entity Address, Postal Zip Code	OX11 0DF
City Area Code	+44 (0)
Local Phone Number	1865 818 808
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,369,838
Entity Central Index Key	0001828185
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false
Ordinary shares
Document Information
Title of 12(b) Security	Ordinary shares, nominal value £0.000025 per share
American Depositary Shares
Document Information
Title of 12(b) Security	American Depositary Shares
Trading Symbol	VACC
Security Exchange Name	NASDAQ