Marketable Securities - Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Cash equivalents, amortized cost	$ 191,721	$ 52,592
Cash equivalents, gross unrealized gains	0	0
Cash equivalents, gross unrealized losses	0	(2)
Cash equivalents, fair value	191,721	52,590
Marketable securities, amortized cost	1,304,304	1,672,164
Marketable securities, gross unrealized gains	3,821	626
Marketable securities, gross unrealized losses	(1,937)	(16,227)
Marketable securities, fair value	1,306,188	1,656,563
Cash equivalents and marketable securities, amortized cost	1,496,025	1,724,756
Cash equivalents and marketable securities, gross unrealized gains	3,821	626
Cash equivalents and marketable securities, gross unrealized losses	(1,937)	(16,229)
Cash equivalents and marketable securities, fair value	1,497,909	1,709,153
Money Market Funds [Member]
Marketable Securities [Line Items]
Cash equivalents, amortized cost	185,990	17,766
Cash equivalents, gross unrealized gains	0	0
Cash equivalents, gross unrealized losses	0	0
Cash equivalents, fair value	185,990	17,766
US Treasury Securities [Member]
Marketable Securities [Line Items]
Cash equivalents, amortized cost	5,731
Cash equivalents, gross unrealized gains	0
Cash equivalents, gross unrealized losses	0
Cash equivalents, fair value	5,731
Marketable securities, amortized cost	22,963
Marketable securities, gross unrealized gains	45
Marketable securities, gross unrealized losses	0
Marketable securities, fair value	23,008
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Cash equivalents, amortized cost		2,151
Cash equivalents, gross unrealized losses		(2)
Cash equivalents, fair value		2,149
Marketable securities, amortized cost	883,550	1,236,770
Marketable securities, gross unrealized gains	3,367	615
Marketable securities, gross unrealized losses	(1,559)	(15,006)
Marketable securities, fair value	885,358	1,222,379
Certificates of Deposit [Member]
Marketable Securities [Line Items]
Marketable securities, amortized cost	47,282	92,417
Marketable securities, gross unrealized gains	0	0
Marketable securities, gross unrealized losses	0	0
Marketable securities, fair value	47,282	92,417
Government-sponsored Enterprise Securities [Member]
Marketable Securities [Line Items]
Marketable securities, amortized cost	195,106	79,746
Marketable securities, gross unrealized gains	377	11
Marketable securities, gross unrealized losses	(352)	(712)
Marketable securities, fair value	195,131	79,045
Commercial Paper [Member]
Marketable Securities [Line Items]
Cash equivalents, amortized cost		32,675
Cash equivalents, gross unrealized gains		0
Cash equivalents, gross unrealized losses		0
Cash equivalents, fair value		32,675
Marketable securities, amortized cost	155,403	263,231
Marketable securities, gross unrealized gains	32	0
Marketable securities, gross unrealized losses	(26)	(509)
Marketable securities, fair value	$ 155,409	$ 262,722