Investments - Summary of Fair Value And Unrealized Losses of Marketable Securities In Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 47,550	$ 343,373
Less than 12 months, Unrealized Losses	(34)	(611)
Greater than 12 months, Fair Value	34,096	123,121
Greater than 12 months, Unrealized Losses	(21)	(640)
Fair Value	81,646	466,494
Unrealized Losses	(55)	(1,251)
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	7,883	52,521
Less than 12 months, Unrealized Losses	(3)	(96)
Greater than 12 months, Fair Value	9,429	41,911
Greater than 12 months, Unrealized Losses	(5)	(251)
Fair Value	17,312	94,432
Unrealized Losses	(8)	(347)
U.S. Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	13,502	111,901
Less than 12 months, Unrealized Losses	(16)	(246)
Greater than 12 months, Fair Value	14,844	43,851
Greater than 12 months, Unrealized Losses	(13)	(238)
Fair Value	28,346	155,752
Unrealized Losses	(29)	(484)
International Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	15,736	43,708
Less than 12 months, Unrealized Losses	(8)	(87)
Greater than 12 months, Fair Value	7,323	6,014
Greater than 12 months, Unrealized Losses	(3)	(35)
Fair Value	23,059	49,722
Unrealized Losses	(11)	(122)
U.S. Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		7,848
Less than 12 months, Unrealized Losses		(1)
Fair Value		7,848
Unrealized Losses		(1)
International Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	3,958	37,300
Less than 12 months, Unrealized Losses	(1)	(38)
Fair Value	3,958	37,300
Unrealized Losses	(1)	(38)
U.S. Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	6,471	90,095
Less than 12 months, Unrealized Losses	(6)	(143)
Greater than 12 months, Fair Value	2,500	31,345
Greater than 12 months, Unrealized Losses	0	(116)
Fair Value	8,971	121,440
Unrealized Losses	$ (6)	$ (259)