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Marketable Securities (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt securities, available-for-sale    
Less than 12 months, fair value $ 85,936 $ 338,605
Less than 12 months, gross unrealized losses (2,356) (1,071)
12 months or greater, fair value 44,193 0
12 months or greater, gross unrealized losses (2,036) 0
Fair value 130,129 338,605
Gross unrealized losses (4,392) (1,071)
U.S. Government bonds and notes    
Debt securities, available-for-sale    
Less than 12 months, fair value 54,924 82,822
Less than 12 months, gross unrealized losses (1,570) (301)
12 months or greater, fair value 11,756 0
12 months or greater, gross unrealized losses (704) 0
Corporate notes, bonds and commercial paper    
Debt securities, available-for-sale    
Less than 12 months, fair value 31,012 255,783
Less than 12 months, gross unrealized losses (786) (770)
12 months or greater, fair value 32,437 0
12 months or greater, gross unrealized losses $ (1,332) $ 0