v3.25.2
Document and Entity Information
Jul. 09, 2025
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 09, 2025
Entity Registrant Name MEREO BIOPHARMA GROUP PLC
Entity Incorporation State Country Code X0
Entity File Number 001-38452
Entity Tax Identification Number 00-0000000
Entity Address Address Line 1 4th Floor
Entity Address Address Line 2 One Cavendish Place
Entity Address City Or Town London
Entity Address Postal Zip Code W1G 0QF
Entity Address Country GB
Country Region 44
City Area Code 333
Local Phone Number 023-7300
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001719714
American Depositary Shares, each representing five Ordinary Shares, par value £0.003 per share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title American Depositary Shares, each representing five Ordinary Shares, par value £0.003 per share
Trading Symbol MREO
Security Exchange Name NASDAQ
Ordinary Shares, nominal value £0.003 per share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Ordinary Shares, nominal value £0.003 per share
Security Exchange Name NASDAQ
No Trading Symbol Flag true