Fair Value Measurements - Summary of Fair Value And Unrealized Losses of Marketable Securities In Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 656,838	$ 513,738
Less than 12 months, Unrealized Losses	(3,410)	(4,795)
Greater than 12 months, Fair Value	154,177	399,783
Greater than 12 months, Unrealized Losses	(2,240)	(5,455)
Fair Value	811,015	913,521
Unrealized Losses	(5,650)	(10,250)
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	140,520	112,243
Less than 12 months, Unrealized Losses	(804)	(1,517)
Greater than 12 months, Fair Value	72,484	185,691
Greater than 12 months, Unrealized Losses	(1,022)	(2,745)
Fair Value	213,004	297,934
Unrealized Losses	(1,826)	(4,262)
U.S. Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	160,348	208,507
Less than 12 months, Unrealized Losses	(1,130)	(1,989)
Greater than 12 months, Fair Value	47,918	130,633
Greater than 12 months, Unrealized Losses	(680)	(1,541)
Fair Value	208,266	339,140
Unrealized Losses	(1,810)	(3,530)
International Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	69,198	50,982
Less than 12 months, Unrealized Losses	(392)	(497)
Greater than 12 months, Fair Value	14,160	68,993
Greater than 12 months, Unrealized Losses	(159)	(636)
Fair Value	83,358	119,975
Unrealized Losses	(551)	(1,133)
U.S. Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	58,232	24,768
Less than 12 months, Unrealized Losses	(75)	(120)
Fair Value	58,232	24,768
Unrealized Losses	(75)	(120)
International Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	83,020	30,987
Less than 12 months, Unrealized Losses	(185)	(175)
Fair Value	83,020	30,987
Unrealized Losses	(185)	(175)
U.S. Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	145,520	86,251
Less than 12 months, Unrealized Losses	(824)	(497)
Greater than 12 months, Fair Value	19,615	14,466
Greater than 12 months, Unrealized Losses	(379)	(533)
Fair Value	165,135	100,717
Unrealized Losses	$ (1,203)	$ (1,030)