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Equity and Stock-based Compensation - Subsidiary Stock and Non-Controlling Interests - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 19, 2014
Jan. 31, 2013
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 0 0      
IPO [Member]          
Class Of Stock [Line Items]          
Conversion rights, shares issued upon conversion of each preferred share       958,996  
FibroGen Europe [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 42,619,022 42,619,022      
Preferred stock redemption percentage Redemption Right — If a Preferred Share can be redeemed by a majority shareholder owning more than ninety percent (90%) of the shares of FibroGen Europe in accordance with the provisions of the Finnish Limited Liability Companies Act, the minority holders of Preferred Shares have the right to request redemption of their shares.        
Minimum percentage of shareholder's approval to call for redemption of preferred shares 90.00%        
Preferred stock, voting rights one vote        
Conversion rights, shares issued upon conversion of each preferred share 1        
FibroGen Europe [Member] | Series A [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 1,700,845 1,700,845      
FibroGen Europe [Member] | Series B [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 1,875,000 1,875,000      
FibroGen Europe [Member] | Series C [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 1,599,503 1,599,503      
FibroGen Europe [Member] | Series D [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 1,520,141 1,520,141      
FibroGen Europe [Member] | Series E [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 459,565 459,565      
FibroGen Europe [Member] | Series F [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 5,714,332 5,714,332      
FibroGen Europe [Member] | Series G [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 9,927,500 9,927,500      
FibroGen Europe [Member] | Series H [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 19,822,136 19,822,136      
FibroGen Cayman [Member]          
Class Of Stock [Line Items]          
Conversion rights, shares issued upon conversion of each preferred share 1        
Convertible promissory note     $ 0.7   $ 0.6
Convertible promissory note interest rate 2.00%        
Conditions of payment of interest, convertible promissory note 0        
FibroGen Cayman [Member] | Series A [Member]          
Class Of Stock [Line Items]          
Preferred stock, shares outstanding 6,758,000 6,758,000      
Preferred shares issued, price per share $ 1.00        
Cash dividend percentage 6.00%