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Summary of significant accounting policies (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Marketable securities | $ 392,221 |  | $ 396,444
Unrealized gains on marketable securities | 1,776 | $ 5,469 |
Fair value, recurring | Money market funds |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Assets at fair value | $ 353,000 |  | $ 366,800

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