Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$ 89,239	$ 32,965
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Value	177,023	205,065
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(53)	0
Fair Value	176,970	205,065
Cash Equivalents	87,731	172,100
Marketable Securities	89,239	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	87,731	155,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	87,731	155,551
Cash Equivalents	87,731	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	87,731	155,551
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	87,731	155,551
Cash Equivalents	87,731	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	89,292	49,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(53)	0
Fair Value	89,239	49,514
Cash Equivalents	0	16,549
Marketable Securities	89,239	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	45,887	49,514
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	45,887	49,514
Cash Equivalents	0	16,549
Marketable Securities	45,887	$ 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	43,405
Gross Unrealized Gains	0
Gross Unrealized Losses	(53)
Fair Value	43,352
Cash Equivalents	0
Marketable Securities	$ 43,352