Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 2,977	$ 48,928
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	129,211	131,158
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(55)
Fair Value	129,211	131,103
Cash Equivalents	126,234	82,175
Marketable Securities	2,977	48,928
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	126,234	77,191
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	126,234	77,191
Cash Equivalents	126,234	77,191
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	126,234	77,191
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	126,234	77,191
Cash Equivalents	126,234	77,191
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	2,977	53,967
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(55)
Fair Value	2,977	53,912
Cash Equivalents	0	4,984
Marketable Securities	2,977	48,928
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		18,701
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		18,701
Cash Equivalents		0
Marketable Securities		18,701
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	2,977	35,266
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(55)
Fair Value	2,977	35,211
Cash Equivalents	0	4,984
Marketable Securities	$ 2,977	$ 30,227