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Senior Secured Term Loan Facilities - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2023
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jul. 14, 2025
Debt Instrument [Line Items]            
Accrued interest   $ 400   $ 400    
Minimum [Member]            
Debt Instrument [Line Items]            
Unrestricted cash and cash equivalent balance required to maintain in accounts   18,750   $ 18,750    
Debt Financing Agreement [Member]            
Debt Instrument [Line Items]            
Interest rate per annum 14.00%          
Maturity date May 08, 2026          
Repayment description       The Term Loans shall mature on May 8, 2026. Therefore, the balance of the Term Loans was included in senior secured term loan facilities, current, under the current liabilities on the condensed consolidated balance sheet as of June 30, 2025. The Term Loans will not be subject to amortization payments. The Company is permitted to prepay the Term Loans 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 Term Loans being repaid or prepaid, plus accrued and unpaid interest of the portion of the Term Loans being repaid or prepaid, plus an amount equal to the remaining scheduled interest payments due on such portion of the Term Loans being repaid or prepaid as if such Term Loans were to remain outstanding until the scheduled maturity date.    
Debt Financing Agreement [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Unrestricted cash and cash equivalent balance required to maintain in accounts   $ 22,500   $ 22,500    
Debt Financing Agreement [Member] | Minimum [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Unrestricted cash and cash equivalent balance required to maintain in accounts           $ 18,750
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 $ 75,000          
Delayed Draw Term Loan [Member] | Debt Financing Agreement [Member]            
Debt Instrument [Line Items]            
Term loan 37,500          
Delayed Draw Term Loan 2 | Debt Financing Agreement [Member]            
Debt Instrument [Line Items]            
Term loan $ 37,500          
FibroGen International [Member]            
Debt Instrument [Line Items]            
Interest expense   $ 3,000 $ 2,900 $ 5,900 $ 5,800