Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 28,335	$ 49,787
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	290,051	325,227
Gross Unrealized Gains	0	24
Gross Unrealized Losses	(4)	(1)
Fair Value	290,047	325,251
Cash Equivalents	261,712	275,464
Marketable Securities	28,335	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	261,712	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	261,712	270,476
Cash Equivalents	261,712	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	261,712	270,476
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	261,712	270,476
Cash Equivalents	261,712	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	28,339	54,751
Gross Unrealized Gains	0	24
Gross Unrealized Losses	(4)	(1)
Fair Value	28,335	54,775
Cash Equivalents	0	4,988
Marketable Securities	28,335	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	7,482	19,295
Gross Unrealized Gains	0	8
Gross Unrealized Losses	0	0
Fair Value	7,482	19,303
Cash Equivalents	0	1,998
Marketable Securities	7,482	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	8,957	17,762
Gross Unrealized Gains	0	8
Gross Unrealized Losses	0	0
Fair Value	8,957	17,771
Cash Equivalents	0	2,990
Marketable Securities	8,957	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	11,900	17,694
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(4)	(1)
Fair Value	11,896	17,701
Cash Equivalents	0
Marketable Securities	$ 11,896	$ 17,701