Supplemental Balance Sheet and Income Statement Information - Investment income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment income (loss)
Interest and dividend income	$ 45,900	$ 15,474	$ 1,527
Gains (losses) on marketable securities	(2,080)	(482)	30
Investment income (loss)	$ 43,820	$ 14,992	$ 1,557