Marketable Securities - Summary of Marketable Securities by Security (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Amortized Cost	$ 1,129,098	$ 1,107,854
Gross Unrealized Gains	750	2,593
Gross Unrealized Losses	(2,105)	(240)
Fair Value	1,127,743	1,110,207
Commercial paper [Member]
Marketable Securities [Line Items]
Amortized Cost	124,045	107,889
Gross Unrealized Gains	2	17
Gross Unrealized Losses	(82)	(22)
Fair Value	123,965	107,884
Corporate bonds [Member]
Marketable Securities [Line Items]
Amortized Cost	791,990	772,457
Gross Unrealized Gains	644	2,233
Gross Unrealized Losses	(1,707)	(184)
Fair Value	790,927	774,506
Government and agency securities [Member]
Marketable Securities [Line Items]
Amortized Cost	193,418	207,684
Gross Unrealized Gains	100	340
Gross Unrealized Losses	(316)	(34)
Fair Value	193,202	207,990
US Treasury Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	19,645	19,824
Gross Unrealized Gains	4	3
Gross Unrealized Losses	0	0
Fair Value	$ 19,649	$ 19,827