Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 242,084	$ 350,615
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses	(103)	(7)
Aggregate Fair Value	241,981	350,609
Level 1 [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	74,109	267,968
Aggregate Fair Value	74,109	267,968
Level 2 [Member] | Commercial Paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	85,352	59,930
Gross Unrealized Holding Losses	(27)
Aggregate Fair Value	85,325	59,930
Level 2 [Member] | Corporate Debt [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	48,814
Gross Unrealized Holding Losses	(24)
Aggregate Fair Value	48,790
Level 2 [Member] | Government Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	33,809
Gross Unrealized Holding Losses	(52)
Aggregate Fair Value	$ 33,757
Level 2 [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost		22,717
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses		(7)
Aggregate Fair Value		$ 22,711