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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Assets
Money market funds	$ 119,332	$ 150,279	$ 154,511	$ 202,004
Available-for-sale debt securities	644,660	592,023
U.S. treasuries
Assets
Available-for-sale debt securities	170,325	74,237
U.S. government agency securities
Assets
Available-for-sale debt securities	167,859	216,688
Corporate debt securities
Assets
Available-for-sale debt securities	306,476	301,098
Recurring Fair Value Measurements
Assets
Total assets	744,820	731,112
Recurring Fair Value Measurements | Money market funds
Assets
Money market funds	100,160	131,635
Recurring Fair Value Measurements | U.S. treasuries
Assets
Available-for-sale debt securities	170,325	74,237
Recurring Fair Value Measurements | U.S. government agency securities
Assets
Available-for-sale debt securities	167,859	216,688
Recurring Fair Value Measurements | Corporate debt securities
Assets
Available-for-sale debt securities	306,476	308,552
Recurring Fair Value Measurements | Level 1
Assets
Total assets	100,160	131,635
Recurring Fair Value Measurements | Level 1 | Money market funds
Assets
Money market funds	100,160	131,635
Recurring Fair Value Measurements | Level 1 | U.S. treasuries
Assets
Available-for-sale debt securities	0	0
Recurring Fair Value Measurements | Level 1 | U.S. government agency securities
Assets
Available-for-sale debt securities	0	0
Recurring Fair Value Measurements | Level 1 | Corporate debt securities
Assets
Available-for-sale debt securities	0	0
Recurring Fair Value Measurements | Level 2
Assets
Total assets	644,660	599,477
Recurring Fair Value Measurements | Level 2 | Money market funds
Assets
Money market funds	0	0
Recurring Fair Value Measurements | Level 2 | U.S. treasuries
Assets
Available-for-sale debt securities	170,325	74,237
Recurring Fair Value Measurements | Level 2 | U.S. government agency securities
Assets
Available-for-sale debt securities	167,859	216,688
Recurring Fair Value Measurements | Level 2 | Corporate debt securities
Assets
Available-for-sale debt securities	306,476	308,552
Recurring Fair Value Measurements | Level 3
Assets
Total assets	0	0
Recurring Fair Value Measurements | Level 3 | Money market funds
Assets
Money market funds	0	0
Recurring Fair Value Measurements | Level 3 | U.S. treasuries
Assets
Available-for-sale debt securities	0	0
Recurring Fair Value Measurements | Level 3 | U.S. government agency securities
Assets
Available-for-sale debt securities	0	0
Recurring Fair Value Measurements | Level 3 | Corporate debt securities
Assets
Available-for-sale debt securities	$ 0	$ 0

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Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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