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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | --- | ---
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Marketable securities - available for sale | $ 971,244 |  | $ 330,953 |
ClearPoint Equity Investments |  |  |  | $ 10,028
Contingent consideration payable |  | $ 0 | 800 |
Transfers of assets measured between Level 1, Level 2, and Level 3 | 0 |  | 0 |
Recurring basis |  |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Marketable securities - available for sale | 971,244 |  | 330,953 |
Marketable securities - equity investments | 43,956 |  | 29,034 |
ClearPoint Equity Investments | 19,493 |  | 13,759 |
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Marketable securities - equity investments | 43,956 |  | 29,034 |
ClearPoint Equity Investments | 19,493 |  | 13,759 |
Recurring basis | Significant other observable inputs (Level 2) |  |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Marketable securities - available for sale | $ 971,244 |  | 330,953 |
Recurring basis | Net Sales Milestones |  |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Contingent consideration payable |  |  | 800 |
Recurring basis | Net Sales Milestones | Significant unobservable inputs (Level 3) |  |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |  |
Contingent consideration payable |  |  | $ 800 |

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