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Cash, Cash Equivalents and Short-Term Investments - Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Cash, Cash Equivalents and Short-Term Investments    
Cash accounts in banking institutions $ 1.4 $ 1.3
Money market funds 102.9 119.3
Accrued interest receivable $ 0.1 $ 0.2