Available-for-sale Securities - Summary of Amortized Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 682,198	$ 441,963
Gross Unrealized Gain	91	131
Gross Unrealized Loss	(28)	(15)
Estimated Fair Value	682,261	$ 442,079
Mature in One Year or Less
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	674,200
Gross Unrealized Gain	90
Gross Unrealized Loss	(28)
Estimated Fair Value	674,262
Mature after One Year through Two Years
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	7,998
Gross Unrealized Gain	1
Estimated Fair Value	$ 7,999

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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Amount 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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