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Short-term investments - Summary of Short-term Investments (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Debt Securities, Available-for-Sale [Line Items]    
Gross Unrealized Losses $ (2,430) $ (2,430)
Short-Term Investments [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 196,776 196,776
Gross Unrealized Gains   0
Gross Unrealized Losses (2,400) (2,429)
Fair Value 194,347 194,347
Corporate Debt Securities [Member] | Short-Term Investments [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 173,376 173,376
Gross Unrealized Losses   (2,326)
Fair Value 171,050 171,050
Asset-Backed Securities [Member] | Short-Term Investments [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 20,449 20,449
Gross Unrealized Losses   (86)
Fair Value 20,363 20,363
Government securities [Member] | Short-Term Investments [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 2,951 2,951
Gross Unrealized Losses   (17)
Fair Value $ 2,934 $ 2,934