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Marketable Securities (Details 3) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt securities, available-for-sale |  |
Less than 12 months, fair value | $ 204,405 | $ 251,897
Less than 12 months, gross unrealized loss | (156) | (122)
US Government bonds and notes |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 54,628 | 70,548
Less than 12 months, gross unrealized loss | (16) | (40)
Corporate notes, bonds and commercial paper |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 149,777 | 181,349
Less than 12 months, gross unrealized loss | $ (140) | $ (82)

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