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Consolidated balance sheet components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Prepaid expenses | $ 12,465 | $ 4,904
Capitalized cloud computing costs, short term | 808 | 0
Short term deposits | 745 | 0
Other current assets | 1,909 | 1,132
Prepaid expenses and other current assets | $ 15,927 | $ 6,036

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