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Marketable Investments - Unrealized Losses on Debt Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value $ 5,401 $ 11,604
Less than 12 Months - Unrealized Losses 49 153
12 Months or Greater - Market Value 4,349 8,084
12 Months or Greater - Unrealized Losses 92 66
Corporate obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value 3,417 9,619
Less than 12 Months - Unrealized Losses 34 139
12 Months or Greater - Market Value 4,349 8,084
12 Months or Greater - Unrealized Losses 92 66
Federal agency obligations [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value 1,984 1,985
Less than 12 Months - Unrealized Losses 15 14
12 Months or Greater - Market Value 0 0
12 Months or Greater - Unrealized Losses $ 0 $ 0