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Basic and Diluted Loss per Common Share - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2025
shares
Class of Stock [Line Items]  
Common stock, conversion ratio Each share of class B common stock is convertible at any time, at the option of the holder, into one share of class A common stock.
Convertible, shares 0.1
Class A  
Class of Stock [Line Items]  
Common stock, votes per share one
Class B Convertible  
Class of Stock [Line Items]  
Common stock, votes per share ten