Fair Value Measurements - Summary of Financial Assets Measured at Fair Value On Recurring Basis by Level Within Fair Value Hierarchy (Detail) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	$ 75,872	$ 75,953
Gross Unrealized Holding Gains		1
Gross Unrealized Holding Losses	(8)
Aggregate Fair Value	75,864	75,954
Level 1 | Cash equivalents | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	50,147	56,056
Aggregate Fair Value	50,147	56,056
Level 1 | Short-term investments | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs		14,999
Gross Unrealized Holding Gains		1
Aggregate Fair Value		15,000
Level 2 | Short-term investments | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	13,286
Aggregate Fair Value	13,286
Level 2 | Short-term investments | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	10,416	4,898
Gross Unrealized Holding Losses	(6)
Aggregate Fair Value	10,410	$ 4,898
Level 2 | Short-term investments | Yankee debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Costs	2,023
Gross Unrealized Holding Losses	(2)
Aggregate Fair Value	$ 2,021