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Fair value measurements - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | $ 106,044 | $ 0
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 101,118 |
U.S. government agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 4,926 |
Recurring basis | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 29,509 |
Recurring basis | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 101,118 |
Recurring basis | U.S. government agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 4,926 |
Recurring basis | Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 29,509 |
Recurring basis | Quoted Prices in Active Markets (Level 1) | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 101,118 |
Recurring basis | Quoted Prices in Active Markets (Level 1) | U.S. government agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 0 |
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 4,926 |
Recurring basis | Significant Unobservable Inputs (Level 3) | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash equivalents | 0 |
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | 0 |
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. government agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Short-term marketable securities | $ 0 |

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