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Senior Secured Term Loan Facilities - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 29, 2025
Debt Instrument [Line Items]            
Term loan           $ 75,000
Paid to the Lenders           80,900
Outstanding interest amount   $ 400   $ 400    
Premium and fees   5,500   5,500   $ 5,500
Amortization of issuance costs   1,100   1,100    
Loss on debt extinguishments   $ (6,583) $ 0 $ (6,583) $ 0  
Debt Financing Agreement [Member]            
Debt Instrument [Line Items]            
Interest rate per annum 14.00%          
Maturity date May 08, 2026          
Repayment description       The Initial Term Loan would mature on May 8, 2026. The Initial Term Loan was subject to amortization payments. The Company was permitted to prepay the Initial Term Loan from time to time, in whole or in part, subject to payment of a make-whole amount equal to the unpaid principal amount of the portion of the Initial Term Loan being repaid or prepaid, plus accrued and unpaid interest of the portion of the Initial Term Loan being repaid or prepaid, plus an amount equal to the remaining scheduled interest payments due on such portion of the Initial Term Loan being repaid or prepaid as if such Initial Term Loan were to remain outstanding until the scheduled maturity date.    
Initial Term Loan [Member]            
Debt Instrument [Line Items]            
Interest rate per annum   16.13% 16.13% 16.13% 16.13%  
Issuance costs and related transaction costs, amortised   $ 3,700   $ 3,700    
Initial Term Loan [Member] | Debt Financing Agreement [Member]            
Debt Instrument [Line Items]            
Term loan $ 74,100          
Initial term loan amount 75,000          
Issuance cost $ 900          
FibroGen International [Member]            
Debt Instrument [Line Items]            
Interest expense   $ 1,900 $ 2,900 $ 7,800 $ 8,700