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Balance Sheets Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Prepaid Expense And Other Assets Current [Abstract] |  |
Advance to suppliers | $ 0 | $ 853
Prepaid expenses | 2,398 | 1,074
Other current assets | 2,078 | 722
Total prepaid and other current assets | $ 4,476 | $ 2,649

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