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Short-term investments - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items] |  |  |
Accrued interest | $ 1.0 | $ 1.0 | $ 1.4
Interest Income [Member] |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gain (loss) in short-term investments | $ 0.2 | $ 0.5 |

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