Cash, Cash Equivalents And Marketable Securities - Summarizes the Unrealized Gains and Losses in Fair Value of the Company's Investments in Debt Securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized Cost	$ 349,823	$ 159,434
Unrealized Gains	1,044	271
Unrealized Losses	0	(20)
Estimated Fair Value	350,867	159,685
Cash and Cash Equivalents	27,256	45,681
Marketable Securities	326,053	115,035
Cash Equivalents and Marketable Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	349,823	159,434
Unrealized Gains	1,044	271
Unrealized Losses	0	(20)
Estimated Fair Value	350,867	159,685
Cash and Cash Equivalents	24,814	44,650
Marketable Securities	326,053	115,035
Money Market Funds [Member] | Level 1
Marketable Securities [Line Items]
Amortized Cost	24,814	44,650
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	24,814	44,650
Cash and Cash Equivalents	24,814	44,650
Marketable Securities	0	0
US Government Bonds [Member] | Level 2
Marketable Securities [Line Items]
Amortized Cost	186,687	63,619
Unrealized Gains	601	70
Unrealized Losses	0	(6)
Estimated Fair Value	187,288	63,683
Cash and Cash Equivalents	0	0
Marketable Securities	187,288	63,683
US Government Agency Securities [Member] | Level 2
Marketable Securities [Line Items]
Amortized Cost	5,996	19,665
Unrealized Gains	3	7
Unrealized Losses	0	(14)
Estimated Fair Value	5,999	19,658
Cash and Cash Equivalents	0	0
Marketable Securities	5,999	19,658
Corporate Debt Securities [Member] | Level 2
Marketable Securities [Line Items]
Amortized Cost	132,326	31,500
Unrealized Gains	440	194
Unrealized Losses	0	0
Estimated Fair Value	132,766	31,694
Cash and Cash Equivalents	0	0
Marketable Securities	132,766	31,694
Cash [Member]
Marketable Securities [Line Items]
Cash and Cash Equivalents	$ 2,442	$ 1,031