Marketable Securities (Details 3) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt securities, available-for-sale
Less than 12 months, fair value	$ 184,073	$ 78,861
Less than 12 months, gross unrealized losses	(457)	(93)
12 months or greater, fair value	23,920	23,460
12 months or greater, gross unrealized losses	(255)	(524)
Fair value	207,993	102,321
Gross unrealized losses	(712)	(617)
U.S. Government bonds and notes
Debt securities, available-for-sale
Less than 12 months, fair value	109,953	32,454
Less than 12 months, gross unrealized losses	(336)	(53)
12 months or greater, fair value	7,115	6,841
12 months or greater, gross unrealized losses	(83)	(159)
Corporate bonds, commercial paper and notes
Debt securities, available-for-sale
Less than 12 months, fair value	74,120	46,407
Less than 12 months, gross unrealized losses	(121)	(40)
12 months or greater, fair value	16,805	16,619
12 months or greater, gross unrealized losses	$ (172)	$ (365)