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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

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