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Document and Entity Information
Nov. 06, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001650648
Document Type 8-K
Document Period End Date Nov. 06, 2025
Entity Registrant Name 4D Molecular Therapeutics, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-39782
Entity Tax Identification Number 47-3506994
Entity Address, Address Line One 5858 Horton Street
Entity Address, Address Line Two #455
Entity Address, City or Town Emeryville
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94608
City Area Code (510)
Local Phone Number 505-2680
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.0001 par value per share
Trading Symbol FDMT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false