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Document and Entity Information
Feb. 24, 2025
Cover [Abstract]  
Entity Registrant Name FIBROGEN INC
Amendment Flag false
Entity Central Index Key 0000921299
Document Type 8-K
Document Period End Date Feb. 24, 2025
Entity Incorporation State Country Code DE
Entity File Number 001-36740
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
Security 12b Title Common Stock, $0.01 par value
Trading Symbol FGEN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false