v3.25.1
Document And Entity Information
Jun. 10, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Period End Date Jun. 10, 2025
Entity Registrant Name FIBROGEN, INC.
Entity Central Index Key 0000921299
Entity Emerging Growth Company false
Entity File Number 001-36740
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 77-0357827
Entity Address, Address Line One 350 Bay Street
Entity Address, Address Line Two Suite 100 #6009
Entity Address, City or Town San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94133
City Area Code 415
Local Phone Number 978-1200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol FGEN
Security Exchange Name NASDAQ