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Summary of Activity for Stock Options (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Stock Options Number Outstanding    
Beginning Balance 444,460  
Ending Balance 444,460 444,460
Vested or expected to vest as of June 30, 2025 444,460  
Exercisable as of June 30, 2025 444,460  
Stock Options Average Intrinsic Value    
Beginning Balance $ 0  
Ending Balance 0 $ 0
Vested or expected to vest as of June 30, 2025 0  
Exercisable as of June 30, 2025 $ 0  
Stock Options Remaining Contractual Life (in years)    
Weighted Average Remaining Contractual Term (Years) 11 months 4 days 1 year 5 months 4 days
Vested or expected to vest as of June 30, 2025 11 months 4 days  
Exercisable as of June 30, 2025 11 months 4 days  
Stock Options Weighted Average Exercise Price per share    
Beginning Balance $ 4.36  
Ending Balance 4.36 $ 4.36
Vested or expected to vest as of June 30, 2025 4.36  
Exercisable as of June 30, 2025 $ 4.36