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Short-Term Investments - Equity Securities (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Equity Securities, FV-NI [Abstract]    
Equity securities $ 1.2 $ 1.0
Debt Securities, Trading, and Equity Securities, FV-NI, Cost [Abstract]    
Equity securities with an initial cost 0.5  
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract]    
Equity securities unrealized gain (loss) $ 0.7 $ 0.5