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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Investment income (loss) |  |  |  |
Interest and dividend income, including correction | $ (290) |  |  |
Interest and dividend income |  | $ 1,230 | $ 1,003 | $ 3,603
Gains (losses) on marketable securities | 228 | 806 | 198 | (4,765)
Investment income (loss) | $ (62) | $ 2,036 | $ 1,201 | $ (1,162)

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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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