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Marketable Securities - Available-For-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 306,504	$ 266,750
Gross Unrealized Gains	216	313
Gross Unrealized Losses	(11)	(6)
Fair Market Value	306,709	267,057
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	165,966	88,535
Gross Unrealized Gains	129	68
Gross Unrealized Losses	(3)	(2)
Fair Market Value	166,092	88,601
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	140,538	129,860
Gross Unrealized Gains	87	196
Gross Unrealized Losses	(8)	(1)
Fair Market Value	$ 140,617	130,055
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		48,355
Gross Unrealized Gains		49
Gross Unrealized Losses		(3)
Fair Market Value		$ 48,401

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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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