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Summary of significant accounting policies - Fair Value of Recurring Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Strategic investments | $ 10,000 | $ 0
Fair Value, Recurring | Level 1 |  |
Assets |  |
Strategic investments | 0 | 0
Total assets, fair value | 0 | 0
Liabilities |  |
Cash settled stock appreciation rights | 0 | 0
Redeemable convertible preferred stock warrants |  | 0
Total liabilities, fair value | 0 | 0
Fair Value, Recurring | Level 2 |  |
Assets |  |
Strategic investments | 0 | 0
Total assets, fair value | 0 | 0
Liabilities |  |
Cash settled stock appreciation rights | 0 | 0
Redeemable convertible preferred stock warrants |  | 0
Total liabilities, fair value | 0 | 0
Fair Value, Recurring | Level 3 |  |
Assets |  |
Strategic investments | 10,000 | 0
Total assets, fair value | 10,000 | 0
Liabilities |  |
Cash settled stock appreciation rights | 818 | 268
Redeemable convertible preferred stock warrants |  | 160
Total liabilities, fair value | $ 818 | $ 428

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