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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities - available for sale | $ 306,079 | $ 260,104
Contingent consideration payable | 36,200 | 36,300
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 |  |
ClearPoint Equity Investments | 6,083 | 6,074
ClearPoint convertible debt security | 12,719 | 12,553
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
ClearPoint Equity Investments | 6,083 | 6,074
Recurring basis | Significant other observable inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
ClearPoint convertible debt security | 12,719 | 12,553
Recurring basis | Development and Regulatory Milestones |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Contingent consideration payable | 26,900 | 26,600
Recurring basis | Development and Regulatory Milestones | Significant unobservable inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Contingent consideration payable | 26,900 | 26,600
Recurring basis | Net Sales Milestones and Royalties |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Contingent consideration payable | 9,300 | 9,700
Recurring basis | Net Sales Milestones and Royalties | Significant unobservable inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Contingent consideration payable | 9,300 | 9,700
Recurring basis | Marketable securities |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities - available for sale | 306,079 | 260,104
Marketable securities - equity investments | 30,379 | 22,634
Recurring basis | Marketable securities | 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 | 30,379 | 22,634
Recurring basis | Marketable securities | Significant other observable inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on recurring basis |  |
Marketable securities - available for sale | $ 306,079 | $ 260,104

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