Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 89,033	$ 32,965
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	156,449	205,065
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(239)	0
Fair Value	156,210	205,065
Cash Equivalents	67,177	172,100
Marketable Securities	89,033	32,965
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	62,178	155,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	62,178	155,551
Cash Equivalents	62,178	155,551
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	62,178	155,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	62,178	155,551
Cash Equivalents	62,178	155,551
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	94,271	49,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(239)	0
Fair Value	94,032	49,514
Cash Equivalents	4,999	16,549
Marketable Securities	89,033	32,965
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	30,926	49,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	30,926	49,514
Cash Equivalents	4,999	16,549
Marketable Securities	25,927	$ 32,965
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	63,345
Gross Unrealized Gains	0
Gross Unrealized Losses	(239)
Fair Value	63,106
Cash Equivalents	0
Marketable Securities	$ 63,106