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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Income Tax [Line Items]              
Income tax expense $ 0 $ 0 $ 0 $ 1,000 $ 8,000 $ 14,000  
Federal statutory tax rate     21.00%   21.00% 21.00%  
Effective tax rate 0.00% 0.00% 0.00% 0.00% (0.10%) (0.10%)  
Uncertain tax positions $ 0   $ 0   $ 16,000 $ 16,000 $ 17,000
Increase (decrease) in net valuation allowance         $ 3,700,000 $ 6,300,000  
Operating loss carryforwards limitations on use         it has not forfeited the right to carryforward tax losses up to 20 years    
Tax years subject to examination to extent of NOLs being carried forward         2004    
Recognized any interest and penalties related to uncertain tax positions         $ 0    
Maximum [Member]              
Schedule Of Income Tax [Line Items]              
Right to carryforward tax losses, period         20 years    
Tax year subject to examination by the tax authorities         2022    
Minimum [Member]              
Schedule Of Income Tax [Line Items]              
Tax year subject to examination by the tax authorities         2004    
Federal [Member]              
Schedule Of Income Tax [Line Items]              
Aggregate amount of net operating loss         $ 94,100,000    
Operating loss carryforward         230,500,000    
Operating loss carryforward expected to be unavailable         136,400,000    
State [Member]              
Schedule Of Income Tax [Line Items]              
Aggregate amount of net operating loss         $ 60,400,000