Cash, Cash Equivalents and Investments - Amortized Cost to Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 383,589	$ 699,693
Gross Unrealized Gains	588	743
Gross Unrealized Losses	(10,555)	(27,560)
Fair Value, Total	373,622	672,876
Treasury Bills [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Total	43,523
Treasury Bills [Member] | Long-term investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,654	44,333
Gross Unrealized Gains	82	79
Gross Unrealized Losses	(213)	(198)
Fair Value, Total	43,523	44,214
Treasury Bills [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		11,602
Gross Unrealized Gains		0
Gross Unrealized Losses		(270)
Fair Value, Total		11,332
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Total	19,314
Asset-Backed Securities [Member] | Long-term investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,773	35,144
Gross Unrealized Gains	0	103
Gross Unrealized Losses	(1,010)	(1,708)
Fair Value, Total	15,763	33,539
Asset-Backed Securities [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,637	27,607
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(86)	(717)
Fair Value, Total	3,551	26,890
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Total	308,816
Corporate Bonds [Member] | Long-term investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	189,326	394,576
Gross Unrealized Gains	506	561
Gross Unrealized Losses	(5,867)	(20,697)
Fair Value, Total	183,965	374,440
Corporate Bonds [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	128,150	167,558
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,299)	(3,503)
Fair Value, Total	124,851	164,055
Sovereign Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Total	1,969
Sovereign Bonds [Member] | Long-term investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,037	2,095
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(58)	(171)
Fair Value, Total	979	1,924
Sovereign Bonds [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,012
Gross Unrealized Gains	0
Gross Unrealized Losses	(22)
Fair Value, Total	$ 990
Municipal Bonds [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		635
Gross Unrealized Gains		0
Gross Unrealized Losses		(11)
Fair Value, Total		624
Agency Bonds [Member] | Short-term Investments [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16,143
Gross Unrealized Gains		0
Gross Unrealized Losses		(285)
Fair Value, Total		$ 15,858