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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol FGEN    
Entity Registrant Name FIBROGEN, INC.    
Entity Central Index Key 0000921299    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Entity 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 Common Stock, Shares Outstanding   87,999,804  
Entity Public Float     $ 2,463.8
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K incorporate information by reference from the definitive proxy statement for the registrant’s 2020 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than after 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.