Fair Value Measurements - Summary of Gross Unrealized Gains and Losses of Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 928,106	$ 1,120,000
Gross Unrealized Gains	495	44
Gross Unrealized Losses	(5,573)	(10,250)
Fair Value	923,028	1,109,794
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	234,555	307,173
Gross Unrealized Gains	282
Gross Unrealized Losses	(2,149)	(4,262)
Fair Value	232,688	302,911
U.S. Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	269,052	358,019
Gross Unrealized Gains	66	6
Gross Unrealized Losses	(1,808)	(3,530)
Fair Value	267,310	354,495
International Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,313	128,374
Gross Unrealized Gains	7	7
Gross Unrealized Losses	(554)	(1,133)
Fair Value	75,766	127,248
U.S. Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	62,529	63,234
Gross Unrealized Gains	2
Gross Unrealized Losses	(103)	(120)
Fair Value	62,428	63,114
International Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	109,180	133,338
Gross Unrealized Losses	(181)	(175)
Fair Value	108,999	133,163
U.S. Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,286	15,613
Fair Value	15,286	15,613
U.S. Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	161,191	114,249
Gross Unrealized Gains	138	31
Gross Unrealized Losses	(778)	(1,030)
Fair Value	$ 160,551	$ 113,250