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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax [Line Items]        
Income tax expense (benefits) $ 0 $ 0 $ 16,000 $ 0
Research and Development Tax Credits        
Income Tax [Line Items]        
Income tax expense (benefits)     0  
Federal Income Tax        
Income Tax [Line Items]        
Net operating loss carryforwards 193,700,000   193,700,000  
State Income Tax        
Income Tax [Line Items]        
Net operating loss carryforwards $ 3,700,000   $ 3,700,000  
Net operating loss carryforwards expiration year     2034