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FibroGen Cayman Non-Controlling Interests - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Noncontrolling Interest [Line Items]    
Preferred stock, shares outstanding 0 0
Common stock, shares outstanding 4,045,000 4,037,000
Series A Preferred Shares [Member] | Minority Shareholders [Member]    
Noncontrolling Interest [Line Items]    
Preferred stock, shares outstanding 5,352,706  
FibroGen Cayman [Member]    
Noncontrolling Interest [Line Items]    
Reduction to nonredeemable noncontrolling interests $ 7.5  
Adjustments to additional paid in capital 2.1  
FibroGen Cayman [Member] | Minority Shareholders [Member]    
Noncontrolling Interest [Line Items]    
Total dividends distributed $ 5.4  
FibroGen Cayman [Member] | Series A Preferred Shares [Member]    
Noncontrolling Interest [Line Items]    
Preferred stock, shares outstanding 15,836,966  
Dividends per share $ 1  
FibroGen International [Member] | Series A Preferred Shares [Member]    
Noncontrolling Interest [Line Items]    
Preferred stock, shares outstanding 10,484,260  
Common stock, shares outstanding 78,000,000