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Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investment income (loss) |  |  |  |
Interest and dividend income | $ 1,230 | $ 2,248 | $ 3,603 | $ 4,281
Gains (losses) on marketable securities | 806 | (1,779) | (4,765) | 5,865
Investment income (loss) | $ 2,036 | $ 469 | $ (1,162) | $ 10,146

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