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Marketable Debt and Equity Securities - Unrealized losses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair value |  |
Fair value, less than 12 months | $ 90,246 | $ 56,645
Fair value, 12 months or greater | 300,465 |
Unrealized losses |  |
Unrealized losses, Less than 12 months | (105) | (9)
Unrealized losses, 12 months or greater | (1,396) |
Corporate Securities |  |
Fair value |  |
Fair value, less than 12 months | 50,337 | 15,843
Fair value, 12 months or greater | 45,872 |
Unrealized losses |  |
Unrealized losses, Less than 12 months | (51) | (6)
Unrealized losses, 12 months or greater | (115) |
Government Securities |  |
Fair value |  |
Fair value, less than 12 months | 39,909 | 40,802
Fair value, 12 months or greater | 254,593 |
Unrealized losses |  |
Unrealized losses, Less than 12 months | (54) | $ (3)
Unrealized losses, 12 months or greater | $ (1,281) |

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