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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Assets
Money market funds	$ 51,720	$ 95,883	$ 132,033	$ 150,279
Available-for-sale debt securities	609,616	617,951
U.S. treasuries
Assets
Available-for-sale debt securities	263,540	199,879
U.S. government agency securities
Assets
Available-for-sale debt securities	144,538	158,871
Corporate debt securities
Assets
Available-for-sale debt securities	201,538	259,201
Recurring Fair Value Measurements
Assets
Total assets	649,343	701,677
Recurring Fair Value Measurements | Money market funds
Assets
Money market funds	39,727	83,726
Recurring Fair Value Measurements | U.S. treasuries
Assets
Available-for-sale debt securities	263,540	199,879
Recurring Fair Value Measurements | U.S. government agency securities
Assets
Available-for-sale debt securities	144,538	158,871
Recurring Fair Value Measurements | Corporate debt securities
Assets
Available-for-sale debt securities	201,538	259,201
Recurring Fair Value Measurements | Level 1
Assets
Total assets	39,727	83,726
Recurring Fair Value Measurements | Level 1 | Money market funds
Assets
Money market funds	39,727	83,726
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	609,616	617,951
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	263,540	199,879
Recurring Fair Value Measurements | Level 2 | U.S. government agency securities
Assets
Available-for-sale debt securities	144,538	158,871
Recurring Fair Value Measurements | Level 2 | Corporate debt securities
Assets
Available-for-sale debt securities	201,538	259,201
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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