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Cash and Cash Equivalents, Investments and Fair Value Measurements - Debt (Details) - Estimate of Fair Value Measurement - Senior Notes - Fair Value, Measurements, Nonrecurring - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Senior Notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | $ 186.4 | $ 202.9
Senior Notes due 2025 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | $ 343.7 | $ 329.5

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