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Investments and fair value measurements - Level 3 Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Preferred Stock |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Exercise of redeemable convertible preferred stock warrants | $ (2,896) |  | $ (2,896) |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 15,000 | $ 0 | 10,000 | $ 0
Purchases of strategic investments |  |  | 5,000 |
Ending balance | 12,104 | 0 | 12,104 | 0
Warrants |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | 160
Exercise of redeemable convertible preferred stock warrants |  |  |  | (160)
Ending balance | 0 | 0 | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Purchases of strategic investments |  |  | 0 |
Stock Appreciation Rights |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance | 419 | 791 | 818 | 268
Vesting and remeasurement of SARs | 165 | 121 | (234) | 644
Amount reclassified from liability to equity upon exchange | (62) |  | (62) |
Ending balance | $ 522 | $ 912 | 522 | $ 912
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Purchases of strategic investments |  |  | $ 0 |

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