Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities and Fair Value Measurements - Financial Assets at Fair Value on Recurring Basis (Detail)

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Marketable Securities and Fair Value Measurements - Financial Assets at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities $ 205,547 $ 92,460  
Cash and cash equivalents 98,786 25,218 $ 34,444
Marketable securities, current 103,498 68,667  
Marketable securities, non, current 5,115    
Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Cash and cash equivalents 96,934 23,793  
Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 87,936 23,794  
Commercial Paper      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 105,831 42,863  
United States Treasury Bills      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 8,026 21,794  
United States Government-Related Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 2,005 4,009  
Cash      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 1,749    
Basis of Fair Value Measurements, Level 1      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 89,685 23,794  
Basis of Fair Value Measurements, Level 1 | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 87,936 23,794  
Basis of Fair Value Measurements, Level 1 | Commercial Paper      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 1 | United States Treasury Bills      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 1 | United States Government-Related Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 1 | Cash      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 1,749    
Basis of Fair Value Measurements, Level 2      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 115,862 68,666  
Basis of Fair Value Measurements, Level 2 | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 2 | Commercial Paper      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 105,831 42,863  
Basis of Fair Value Measurements, Level 2 | United States Treasury Bills      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 8,026 21,794  
Basis of Fair Value Measurements, Level 2 | United States Government-Related Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 2,005 4,009  
Basis of Fair Value Measurements, Level 2 | Cash      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0    
Basis of Fair Value Measurements, Level 3      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 3 | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 3 | Commercial Paper      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 3 | United States Treasury Bills      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 0  
Basis of Fair Value Measurements, Level 3 | United States Government-Related Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities 0 $ 0  
Basis of Fair Value Measurements, Level 3 | Cash      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total cash equivalents and marketable securities $ 0