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Marketable Securities (Details 3) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt securities, available-for-sale |  |
Less than 12 months, fair value | $ 173,002 | $ 338,605
Less than 12 months, gross unrealized losses | (3,806) | (1,071)
12 months or greater, fair value | 16,147 | 0
12 months or greater, gross unrealized losses | (574) | 0
Fair value | 189,149 | 338,605
Gross unrealized losses | (4,380) | (1,071)
U.S. Government bonds and notes |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 62,622 | 82,822
Less than 12 months, gross unrealized losses | (1,890) | (301)
Corporate notes, bonds and commercial paper |  |
Debt securities, available-for-sale |  |
Less than 12 months, fair value | 110,380 | 255,783
Less than 12 months, gross unrealized losses | (1,916) | (770)
12 months or greater, fair value | 16,147 | 0
12 months or greater, gross unrealized losses | $ (574) | $ 0

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