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Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Investment income (loss) |  |  |  |
Interest and dividend income | $ 6,385 | $ 8,595 | $ 12,992 | $ 18,787
Gains (losses) on marketable securities | (256) | (414) | (267) | (405)
Investment income (loss) | $ 6,129 | $ 8,181 | $ 12,725 | $ 18,382

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