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Equity and Other Investments and Fair Value Measurements - Convertible Promissory Note in Gate Neuroscience (Details) - Gate Neuroscience [Member] - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 03, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Convertible Promissory Note Purchase Agreement |  |  |  |
Equity Investment |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 8.00% |  |  |
Debt instrument maturity date | Nov. 24, 2026 |  |  |
Convertible notes face value | $ 15.0 |  |  | $ 51.5
Gate 2025 Convertible Note |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | $ 15.2 |  |
Unrealized gain from fair value changes in equity investments |  | 0.2 |  |
Gate 2021 Convertible Note |  |  |  |
Equity Investment |  |  |  |
Equity and long-term investments at fair value |  | 70.0 |  | $ 50.9
Unrealized gain from fair value changes in equity investments |  | $ 19.1 |  |
Unrealized loss from fair value changes in equity investments |  |  | $ 0.6 |

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