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Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Description Of Business [Line Items]                    
Long Term Loan Amount $ 100,000                  
Duration of long term loan 5 years                  
Net Income (Loss)   $ (17,838) $ (18,541) $ (25,783) $ (27,940) $ (34,454) $ (39,944) $ (62,162) $ (102,338)  
Accumulated deficit   (1,151,885)           (1,151,885)   $ (1,089,723)
Restricted cash   3,329           3,329   $ 3,329
Cash outflow from operating activities               36,800 $ 99,800  
Cash, cash equivalents, restricted cash and short-term investments   $ 182,000           $ 182,000    
Maximum                    
Description Of Business [Line Items]                    
Additional Long Term Loan Amount $ 25,000                  
Common Stock                    
Description Of Business [Line Items]                    
Shares Conversion       14,046,000       14,046,000    
Series A Convertible Preferred Stock                    
Description Of Business [Line Items]                    
Stock issued during the period               863,000    
Purchase price   $ 200           $ 200    
Gross proceeds of private placement               $ 172,700    
Number of shares               842,000