Marketable Investments - Unrealized Losses on Debt Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months - Market Value	$ 17,026	$ 13,098
Less than 12 Months - Unrealized Losses	16	8
12 Months or Greater - Market Value	6,893	6,872
12 Months or Greater - Unrealized Losses	54	71
Corporate obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months - Market Value	17,026	13,098
Less than 12 Months - Unrealized Losses	16	8
12 Months or Greater - Market Value	4,897	4,879
12 Months or Greater - Unrealized Losses	50	64
Federal agency obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months - Market Value	0	0
Less than 12 Months - Unrealized Losses	0	0
12 Months or Greater - Market Value	1,996	1,993
12 Months or Greater - Unrealized Losses	$ 4	$ 7