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Document And Entity Information
Oct. 02, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 02, 2023
Entity Registrant Name FIBROGEN, INC.
Entity Central Index Key 0000921299
Entity Emerging Growth Company false
Securities Act File Number 001-36740
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 77-0357827
Entity Address, Address Line One 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
Entity Information, Former Legal or Registered Name  
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