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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