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Income taxes - Schedule of components of income before income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |
Loss before income taxes | $ (106,420) | $ (16,007) | $ (13,534)
United States [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Loss before income taxes | (106,467) | (16,269) | (13,534)
Foreign [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Loss before income taxes | $ 47 | $ 262 | $ 0

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