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Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 233,036	$ 271,209
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	307,431	366,880
Gross Unrealized Gains	96	199
Gross Unrealized Losses	(13)	(11)
Fair Value	307,514	367,068
Cash Equivalents	74,478	95,859
Marketable Securities	233,036	271,209
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	74,478	95,859
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	74,478	95,859
Cash Equivalents	74,478	95,859
Marketable Securities	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	74,478	95,859
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	74,478	95,859
Cash Equivalents	74,478	95,859
Marketable Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	232,953	271,021
Gross Unrealized Gains	96	199
Gross Unrealized Losses	(13)	(11)
Fair Value	233,036	271,209
Cash Equivalents	0	0
Marketable Securities	233,036	271,209
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	76,510	94,817
Gross Unrealized Gains	6	26
Gross Unrealized Losses	(3)	(1)
Fair Value	76,513	94,842
Cash Equivalents	0	0
Marketable Securities	76,513	94,842
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	128,784	114,599
Gross Unrealized Gains	81	120
Gross Unrealized Losses	(6)	(8)
Fair Value	128,859	114,711
Cash Equivalents	0	0
Marketable Securities	128,859	114,711
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	27,659	61,605
Gross Unrealized Gains	9	53
Gross Unrealized Losses	(4)	(2)
Fair Value	27,664	61,656
Cash Equivalents	0	0
Marketable Securities	$ 27,664	$ 61,656

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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