Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 189,479	$ 49,787
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	262,066	325,227
Gross Unrealized Gains	3	24
Gross Unrealized Losses	(51)	(1)
Fair Value	262,018	325,251
Cash Equivalents	72,539	275,464
Marketable Securities	189,479	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	64,561	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	64,561	270,476
Cash Equivalents	64,561	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	64,561	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	64,561	270,476
Cash Equivalents	64,561	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	197,505	54,751
Gross Unrealized Gains	3	24
Gross Unrealized Losses	(51)	(1)
Fair Value	197,457	54,775
Cash Equivalents	7,978	4,988
Marketable Securities	189,479	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	94,145	19,295
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(18)	0
Fair Value	94,127	19,303
Cash Equivalents	7,978	1,998
Marketable Securities	86,149	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	41,195	17,762
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(13)	0
Fair Value	41,182	17,771
Cash Equivalents	0	2,990
Marketable Securities	41,182	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	62,165	17,694
Gross Unrealized Gains	3	8
Gross Unrealized Losses	(20)	(1)
Fair Value	62,148	17,701
Cash Equivalents	0	0
Marketable Securities	$ 62,148	$ 17,701