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Fair value of financial instruments and investments - Schedule of financial assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Aug. 23, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Marketable securities | $ 58,088 |  | $ 79,454
Contingent consideration payable | 310,240 |  | 0
Fair Value, Measurements, Recurring | Total |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Marketable securities | 58,088 |  | 79,454
Warrant liability | 0 |  | 1
Stock appreciation rights liability | 3,814 |  | 1,665
Deferred consideration payable | 37,700 |  |
Contingent consideration payable | 257,040 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 53,200 |  |
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (level 1) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Marketable securities | 0 |  | 0
Warrant liability | 0 |  | 0
Stock appreciation rights liability | 0 |  | 0
Deferred consideration payable | 0 |  |
Contingent consideration payable | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 0 |  |
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Marketable securities | 58,088 |  | 79,454
Warrant liability | 0 |  | 0
Stock appreciation rights liability | 0 |  | 0
Deferred consideration payable | 37,700 |  |
Contingent consideration payable | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 0 |  |
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Marketable securities | 0 |  | 0
Warrant liability | 0 |  | 1
Stock appreciation rights liability | 3,814 |  | $ 1,665
Deferred consideration payable | 0 |  |
Contingent consideration payable | 257,040 |  |
Agilis |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Deferred consideration payable |  | $ 38,100 |
Agilis | Significant unobservable inputs (level 3) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $ 53,200 |  |

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