Fair Value Measurements - Summary of Gross Unrealized Gains and Losses of Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 886,844	$ 1,120,000
Gross Unrealized Gains	6	44
Gross Unrealized Losses	(5,650)	(10,250)
Fair Value	881,200	1,109,794
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	229,757	307,173
Gross Unrealized Gains	2
Gross Unrealized Losses	(1,826)	(4,262)
Fair Value	227,933	302,911
U.S. Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	229,502	358,019
Gross Unrealized Gains	3	6
Gross Unrealized Losses	(1,810)	(3,530)
Fair Value	227,695	354,495
International Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	86,906	128,374
Gross Unrealized Gains	1	7
Gross Unrealized Losses	(551)	(1,133)
Fair Value	86,356	127,248
U.S. Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	59,392	63,234
Gross Unrealized Losses	(75)	(120)
Fair Value	59,317	63,114
International Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	101,055	133,338
Gross Unrealized Losses	(185)	(175)
Fair Value	100,870	133,163
U.S. Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,893	15,613
Fair Value	13,893	15,613
U.S. Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	166,339	114,249
Gross Unrealized Gains		31
Gross Unrealized Losses	(1,203)	(1,030)
Fair Value	$ 165,136	$ 113,250