0001719714 2026-02-17 2026-02-17 0001719714 dei:AdrMember 2026-02-17 2026-02-17 0001719714 us-gaap:CommonStockMember 2026-02-17 2026-02-17 false true 0001719714 X0 00-0000000 8-K 2026-08-18 MEREO BIOPHARMA GROUP PLC 001-38452 4th Floor One Cavendish Place London W1G 0QF GB 44 333 023-7300 false false false false American Depositary Shares, each representing five Ordinary Shares, par value £0.003 per share MREO NASDAQ Ordinary Shares, nominal value £0.003 per share NASDAQ false