Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 271,209	$ 49,787
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	366,880	325,227
Gross Unrealized Gains	199	24
Gross Unrealized Losses	(11)	(1)
Fair Value	367,068	325,251
Cash Equivalents	95,859	275,464
Marketable Securities	271,209	49,787
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	95,859	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	95,859	270,476
Cash Equivalents	95,859	270,476
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	95,859	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	95,859	270,476
Cash Equivalents	95,859	270,476
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	271,021	54,751
Gross Unrealized Gains	199	24
Gross Unrealized Losses	(11)	(1)
Fair Value	271,209	54,775
Cash Equivalents	0	4,988
Marketable Securities	271,209	49,787
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	94,817	19,295
Gross Unrealized Gains	26	8
Gross Unrealized Losses	(1)	0
Fair Value	94,842	19,303
Cash Equivalents	0	1,998
Marketable Securities	94,842	17,305
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	114,599	17,762
Gross Unrealized Gains	120	8
Gross Unrealized Losses	(8)	0
Fair Value	114,711	17,771
Cash Equivalents	0	2,990
Marketable Securities	114,711	14,781
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	61,605	17,694
Gross Unrealized Gains	53	8
Gross Unrealized Losses	(2)	(1)
Fair Value	61,656	17,701
Cash Equivalents	0	0
Marketable Securities	$ 61,656	$ 17,701