Investments - Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 317,175	$ 320,166
Gross Unrealized Gains	16	186
Gross Unrealized Losses	(228)	(191)
Fair Value	316,963	320,161
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	149,992	128,479
Gross Unrealized Gains	7	124
Gross Unrealized Losses	(64)	(27)
Fair Value	149,935	128,576
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	33,343	47,415
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(37)	(35)
Fair Value	33,306	47,381
Corporate notes and obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	133,840	139,747
Gross Unrealized Gains	9	61
Gross Unrealized Losses	(127)	(128)
Fair Value	$ 133,722	139,680
Time deposits
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		4,525
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Value		$ 4,524