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Cash and Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 641,541	$ 591,177
Unrealized Gains	3,201	1,179
Unrealized Losses	(82)	(333)
Estimated Fair Value	644,660	592,023
Total cash and cash equivalents, and marketable securities, Amortized Cost	760,873	741,455
Total cash and cash equivalents, and marketable securities, Unrealized Gain	3,201	1,180
Total cash and cash equivalents, and marketable securities, Unrealized Loss	(82)	(333)
Total cash and cash equivalents, and marketable securities, Fair Value	763,992	742,302
U.S. treasuries
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	169,214	74,109
Unrealized Gains	1,118	172
Unrealized Losses	(7)	(44)
Estimated Fair Value	170,325	74,237
U.S. government agency securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	166,881	216,265
Unrealized Gains	1,018	692
Unrealized Losses	(40)	(269)
Estimated Fair Value	167,859	216,688
Corporate debt securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	305,446	300,803
Unrealized Gains	1,065	315
Unrealized Losses	(35)	(20)
Estimated Fair Value	306,476	301,098
Cash and cash equivalents:
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	119,332	150,278
Unrealized Gains	0	1
Unrealized Losses	0	0
Estimated Fair Value	119,332	150,279
Cash and cash equivalents: | Cash
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	19,172	11,190
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	19,172	11,190
Cash and cash equivalents: | Money market funds
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	100,160	131,635
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	100,160	131,635
Cash and cash equivalents: | Corporate debt securities
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	0	7,453
Unrealized Gains	0	1
Unrealized Losses	0	0
Estimated Fair Value	$ 0	$ 7,454

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