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Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investment income (loss) |  |  |  |
Interest and dividend income | $ 7,325 | $ 11,479 | $ 20,317 | $ 30,265
Gains (losses) on marketable securities | (2) | 24 | (269) | (380)
Investment income (loss) | $ 7,323 | $ 11,503 | $ 20,048 | $ 29,885

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