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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Aug. 23, 2018
--- | --- | --- | ---
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Marketable securities | $ 185,072 | $ 58,088 |
Deferred consideration payable | 19,300 | 18,300 |
Contingent consideration payable | 344,900 | 310,240 |
Recurring basis | Total |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Marketable securities | 185,072 | 58,088 |
Equity Securities, FV-NI | 6,529 |  |
Stock appreciation rights liability | 2,235 | 3,814 |
Deferred consideration payable | 39,000 | 37,700 |
Contingent consideration payable | 285,300 | 257,040 |
Contingent consideration payable- net sales milestones and royalties | 59,600 | 53,200 |
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 | 0 | 0 |
Equity Securities, FV-NI | 6,529 |  |
Stock appreciation rights liability | 0 | 0 |
Deferred consideration payable | 0 | 0 |
Contingent consideration payable | 0 | 0 |
Contingent consideration payable- net sales milestones and royalties | 0 | 0 |
Recurring basis | Significant other observable inputs (level 2) |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Marketable securities | 185,072 | 58,088 |
Stock appreciation rights liability | 0 | 0 |
Deferred consideration payable | 39,000 | 37,700 |
Contingent consideration payable | 0 | 0 |
Contingent consideration payable- net sales milestones and royalties | 0 | 0 |
Recurring basis | Significant unobservable inputs (level 3) |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Marketable securities | 0 | 0 |
Stock appreciation rights liability | 2,235 | 3,814 |
Deferred consideration payable | 0 | 0 |
Contingent consideration payable | 285,300 | 257,040 |
Agilis |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Deferred consideration payable |  |  | $ 38,100
Agilis | Significant unobservable inputs (level 3) |  |  |
Financial assets and liabilities measured at fair value on recurring basis |  |  |
Contingent consideration payable- net sales milestones and royalties | $ 59,600 | $ 53,200 |

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