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Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Adjusted Cost	$ 122,221	$ 147,903
Unrealized Gains	1,322	1,815
Unrealized Losses	(619)	(38)
Fair Value	122,924	149,680
Mutual and money market funds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Adjusted Cost	87,965	103,404
Unrealized Gains	1,083	1,288
Unrealized Losses	(480)	(20)
Fair Value	88,568	104,672
Corporate bonds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Adjusted Cost	18,935	21,811
Unrealized Gains	168	350
Unrealized Losses	(32)	(6)
Fair Value	19,071	22,155
Government securities - U.S.
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Adjusted Cost	13,503	18,849
Unrealized Gains	64	155
Unrealized Losses	(105)	(5)
Fair Value	13,462	18,999
Other fixed-income securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Adjusted Cost	1,818	3,839
Unrealized Gains	7	22
Unrealized Losses	(2)	(7)
Fair Value	$ 1,823	$ 3,854

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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