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Share-based Compensation - Stock Option Activity Under 2023 Incentive Award Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Options, Weighted Average Exercise Price          
Share-based compensation expense $ 1.0 $ 1.6 $ 4.4 $ 4.9  
Incentive Award Plan 2023 | Stock options          
Options, Number of Shares          
Outstanding, beginning of period     51,016    
Outstanding, end of period 51,016   51,016   51,016
Exercisable, end of period 32,426   32,426    
Options, Weighted Average Exercise Price          
Outstanding, beginning of period     $ 242.14    
Outstanding, end of period $ 242.14   $ 242.14   $ 242.14
Weighted average remaining contractual life of options exercisable     8 years 8 months 12 days   9 years 6 months
Share-based compensation expense $ 0.6 $ 0.5 $ 1.9 $ 1.0  
Unrecognized compensation expense related to non-vested stock options $ 3.4   $ 3.4   $ 5.3
Weighted-average remaining requisite service period for which unrecognized compensation expense     10 months   19 months