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v3.22.2.2

Short-term investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items] |  |  |
Debt securities, available-for-sale, unrealized loss | $ 2,430,000 | $ 2,430,000 |
Short-term investments |  |  | $ 0
Short-Term Investments [Member] |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Proceeds from sale of debt securities, available-for-Sale |  | 0 |
Payments to acquire debt securities, available-for-Sale |  | 196,800,000 |
Debt securities, available-for-sale, unrealized loss | $ 2,400,000 | $ 2,429,000 |

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