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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid expenses | $ 1,073 | $ 2,221
Deposits | 137 | 105
Other current assets | 93 | 67
Total prepaid expenses and other | $ 1,303 | $ 2,393

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