Fair value measurement - Assets and liabilities measured on a recurring basis (Details) - Recurring - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Assets, Fair Value Disclosure [Abstract] | ||
| Cash and cash equivalents | $ 581,270 | $ 247,680 |
| Total assets | 581,270 | 247,680 |
| Liabilities, Fair Value Disclosure [Abstract] | ||
| Contingent consideration | 23,781 | |
| Derivative financial instruments | 2,645 | 2,645 |
| Consideration for post acquisition services | 280 | |
| Total liabilities | 26,706 | 2,645 |
| Fair value hierarchy Level 1 | ||
| Assets, Fair Value Disclosure [Abstract] | ||
| Cash and cash equivalents | 581,270 | 247,680 |
| Total assets | 581,270 | 247,680 |
| Level 3 | ||
| Liabilities, Fair Value Disclosure [Abstract] | ||
| Contingent consideration | 23,781 | |
| Derivative financial instruments | 2,645 | 2,645 |
| Consideration for post acquisition services | 280 | |
| Total liabilities | $ 26,706 | $ 2,645 |