Marketable Investment Securities - Schedule of Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized cost	$ 462,716	$ 881,269
Unrealized gains	0	0
Unrealized losses	(1,022)	(454)
Estimated fair value	461,694	880,815
Corporate bonds
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized cost	194,877	290,169
Unrealized gains	0	0
Unrealized losses	(803)	(385)
Estimated fair value	194,074	289,784
Commercial paper
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized cost	221,670	498,358
Unrealized gains	0	0
Unrealized losses	0	0
Estimated fair value	221,670	498,358
Other debt securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized cost	46,169	92,742
Unrealized gains	0	0
Unrealized losses	(219)	(69)
Estimated fair value	$ 45,950	$ 92,673

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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