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Investments and fair value measurements - Investments on Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Fair Value | $ 493,966 |
Strategic investments | 12,104 | $ 10,000
Level 1 |  |
Assets |  |
Cash equivalents | 1,457 |
Strategic investments | 0 | 0
Liabilities |  |
Cash settled stock appreciation rights | 0 | 0
Level 1 | U.S. government securities |  |
Assets |  |
Cash equivalents | 0 |
Fair Value | 0 |
Level 1 | Money market funds |  |
Assets |  |
Cash equivalents | 1,457 |
Level 2 |  |
Assets |  |
Cash equivalents | 7,464 |
Strategic investments | 0 | 0
Liabilities |  |
Cash settled stock appreciation rights | 0 | 0
Level 2 | U.S. government securities |  |
Assets |  |
Cash equivalents | 7,464 |
Fair Value | 66,052 |
Level 2 | Money market funds |  |
Assets |  |
Cash equivalents | 0 |
Level 3 |  |
Assets |  |
Cash equivalents | 0 |
Strategic investments | 12,104 | 10,000
Liabilities |  |
Cash settled stock appreciation rights | 522 | $ 818
Level 3 | U.S. government securities |  |
Assets |  |
Cash equivalents | 0 |
Fair Value | 0 |
Level 3 | Money market funds |  |
Assets |  |
Cash equivalents | $ 0 |

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