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Description of Business - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 01, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Description Of Business [Line Items]                
Long Term Loan Amount $ 100,000,000              
Duration of long term loan 5 years              
Net Income (Loss)   $ (18,541,000) $ (25,783,000) $ (34,454,000) $ (39,944,000) $ (44,324,000) $ (74,398,000)  
Accumulated deficit   (1,134,047,000)       (1,134,047,000)   $ (1,089,723,000)
Restricted cash   3,329,000       3,329,000   $ 3,329,000
Cash outflow from operating activities           30,500,000    
Proceeds from Operating Activities, Total             $ 79,200,000  
Cash, cash equivalents, restricted cash and short-term investments   $ 187,400,000       $ 187,400,000    
Maximum                
Description Of Business [Line Items]                
Additional Long Term Loan Amount $ 25,000,000              
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