v3.25.3
Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Class A
Class B
Common Shares
Class A
Common Shares
Class B
Additional Paid-in Capital
Additional Paid-in Capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Treasury Shares
Beginning balance (in shares) at Dec. 31, 2023         50,000 35,071,955          
Beginning balance, amount at Dec. 31, 2023 $ 105.6 $ (3.7)         $ 701.0 $ (13.5) $ (591.1) $ 9.8 $ (4.3)
Beginning balance, treasury (in shares) at Dec. 31, 2023                     123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation (in shares)           228,739          
Stock-based compensation 3.9           3.9        
Other (0.3)           (0.3)        
Net loss (22.2)               (22.2)    
Ending balance (in shares) at Sep. 30, 2024         50,000 35,300,694          
Ending balance, amount at Sep. 30, 2024 83.3           691.1   (603.5)   $ (4.3)
Ending balance, treasury (in shares) at Sep. 30, 2024                     123,089
Beginning balance (in shares) at Jun. 30, 2024         50,000 35,226,730          
Beginning balance, amount at Jun. 30, 2024 93.4           690.0   (592.3)   $ (4.3)
Beginning balance, treasury (in shares) at Jun. 30, 2024                     123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation (in shares)           73,964          
Stock-based compensation 1.1           1.1        
Net loss (11.2)               (11.2)    
Ending balance (in shares) at Sep. 30, 2024         50,000 35,300,694          
Ending balance, amount at Sep. 30, 2024 83.3           691.1   (603.5)   $ (4.3)
Ending balance, treasury (in shares) at Sep. 30, 2024                     123,089
Beginning balance (in shares) at Dec. 31, 2024     50,000 37,717,842 50,000 37,717,842          
Beginning balance, amount at Dec. 31, 2024 $ 36.7           700.9   (659.9)   $ (4.3)
Beginning balance, treasury (in shares) at Dec. 31, 2024 123,089                   123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation (in shares)           284,584          
Stock-based compensation $ 1.3           1.3        
Exchange of warrants 1.1           1.1        
Net loss (46.0)               (46.0)    
Ending balance (in shares) at Sep. 30, 2025     50,000 38,002,426 50,000 38,002,426          
Ending balance, amount at Sep. 30, 2025 $ (6.9)           703.3   (705.9)   $ (4.3)
Ending balance, treasury (in shares) at Sep. 30, 2025 123,089                   123,089
Beginning balance (in shares) at Jun. 30, 2025         50,000 37,985,270          
Beginning balance, amount at Jun. 30, 2025 $ (4.7)           701.4   (701.8)   $ (4.3)
Beginning balance, treasury (in shares) at Jun. 30, 2025                     123,089
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Stock-based compensation (in shares)           17,156          
Stock-based compensation 0.8           0.8        
Exchange of warrants 1.1           1.1        
Net loss (4.1)               (4.1)    
Ending balance (in shares) at Sep. 30, 2025     50,000 38,002,426 50,000 38,002,426          
Ending balance, amount at Sep. 30, 2025 $ (6.9)           $ 703.3   $ (705.9)   $ (4.3)
Ending balance, treasury (in shares) at Sep. 30, 2025 123,089                   123,089