Cash, Cash Equivalents and Investments - Gross Unrealized Losses and Fair Value for Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 68,557	$ 382,732
Unrealized Losses, Less than 12 months	(1,561)	(12,718)
Fair Value, Greater than 12 Months	233,304	190,707
Unrealized Losses, Greater than 12 Months	(8,994)	(14,842)
Fair Value	301,861	573,439
Unrealized Losses	(10,555)	(27,560)
Treasury Bills [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	20,725	32,614
Unrealized Losses, Less than 12 months	(153)	(465)
Fair Value, Greater than 12 Months	2,441	102
Unrealized Losses, Greater than 12 Months	(60)	(3)
Fair Value	23,166	32,716
Unrealized Losses	(213)	(468)
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	17,062	47,582
Unrealized Losses, Less than 12 months	(1,049)	(2,299)
Fair Value, Greater than 12 Months	2,252	2,495
Unrealized Losses, Greater than 12 Months	(47)	(126)
Fair Value	19,314	50,077
Unrealized Losses	(1,096)	(2,425)
Sovereign Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	0	967
Unrealized Losses, Less than 12 months	0	(67)
Fair Value, Greater than 12 Months	1,968	957
Unrealized Losses, Greater than 12 Months	(80)	(104)
Fair Value	1,968	1,924
Unrealized Losses	(80)	(171)
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	30,770	285,087
Unrealized Losses, Less than 12 months	(359)	(9,591)
Fair Value, Greater than 12 Months	226,643	187,153
Unrealized Losses, Greater than 12 Months	(8,807)	(14,609)
Fair Value	257,413	472,240
Unrealized Losses	$ (9,166)	(24,200)
Agency Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months		15,858
Unrealized Losses, Less than 12 months		(285)
Fair Value, Greater than 12 Months		0
Unrealized Losses, Greater than 12 Months		0
Fair Value		15,858
Unrealized Losses		(285)
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months		624
Unrealized Losses, Less than 12 months		(11)
Fair Value, Greater than 12 Months		0
Unrealized Losses, Greater than 12 Months		0
Fair Value		624
Unrealized Losses		$ (11)