v3.19.2
Document and Entity Information
Sep. 26, 2019
Cover [Abstract]  
Entity Registrant Name FIBROGEN INC
Amendment Flag false
Entity Central Index Key 0000921299
Document Type 8-K
Document Period End Date Sep. 26, 2019
Entity Incorporation State Country Code DE
Entity File Number 001-36740
Entity Tax Identification Number 77-0357827
Entity Address, Address Line One FibroGen, Inc.
Entity Address, Address Line Two 409 Illinois Street
Entity Address, City or Town San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94158
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