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Share-Based Compensation - Schedule of BitAccess Plan Stock Option Activity (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Employee Stock Option | Bit Access Plan [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Options - Beginning balance 43,780 43,780 43,780  
Options - Granted 0 0    
Options - Exercised 0 0    
Options - End balance 43,780 43,780 43,780 43,780
Options - Vested and exercisable 30,153 20,208    
Weighted-average exercise price - Beginning balance $ 2.86 $ 2.86 $ 2.86  
Weighted-average exercise price - Granted 0 0    
Weighted-average exercise price - Exercised 0 0    
Weighted-average exercise price - End balance 2.86 2.86 $ 2.86 $ 2.86
Weighted-average exercise price - Vested and exercisable $ 2.86 $ 2.86    
Weighted-average remaining contractual term - Outstanding 6 years 10 months 6 days 7 years 10 months 6 days 7 years 7 months 6 days 8 years 7 months 6 days
Weighted-average remaining contractual term - Vested and exercisable 6 years 9 months 10 days      
Weighted-average grant-date fair value - Outstanding $ 3.09 $ 3.09 $ 3.09 $ 1.21
Weighted-average grant-date fair value - Granted 0 0    
Weighted-average grant-date fair value - Exercised 0 0    
Weighted-average grant-date fair value - Vested and exercisable 3.05 3.1    
Restricted Stock Units (RSUs) [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Weighted-average grant-date fair value - Vested and exercisable $ 2.36 $ 3.6