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Marketable Investments - Unrealized Losses on Debt Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months - Market Value $ 19,116 $ 18,509
Less than 12 Months - Unrealized Losses 118 33
12 Months or Greater - Market Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months - Market Value 19,116 18,509
Less than 12 Months - Unrealized Losses 118 33
12 Months or Greater - Market Value 0 0
12 Months or Greater - Unrealized Losses $ 0 $ 0