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Marketable Securities (Details 3) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities, available-for-sale |  |
Less than 12 months, fair value | $ 280,512 | $ 78,861
Less than 12 months, gross unrealized losses | (692) | (93)
12 months or greater, fair value | 5,937 | 23,460
12 months or greater, gross unrealized losses | (63) | (524)
Fair value | 286,449 | 102,321
Gross unrealized losses | (755) | (617)
U.S. Government bonds and notes |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 154,278 | 32,454
Less than 12 months, gross unrealized losses | (467) | (53)
12 months or greater, fair value | 0 | 6,841
12 months or greater, gross unrealized losses | 0 | (159)
Corporate bonds, commercial paper and notes |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 126,234 | 46,407
Less than 12 months, gross unrealized losses | (225) | (40)
12 months or greater, fair value | 5,937 | 16,619
12 months or greater, gross unrealized losses | $ (63) | $ (365)

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