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Marketable Investments - Unrealized Losses on Debt Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value $ 9,260 $ 11,604
Less than 12 Months - Unrealized Losses 104 153
12 Months or Greater - Market Value 4,403 8,084
12 Months or Greater - Unrealized Losses 77 66
Corporate obligations    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value 7,280 9,619
Less than 12 Months - Unrealized Losses 85 139
12 Months or Greater - Market Value 4,403 8,084
12 Months or Greater - Unrealized Losses 77 66
Federal agency obligations    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months - Market Value 1,980 1,985
Less than 12 Months - Unrealized Losses 19 14
12 Months or Greater - Market Value 0 0
12 Months or Greater - Unrealized Losses $ 0 $ 0