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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid expenses | $ 764 | $ 1,620
Notes receivable — current | 232 | 0
Deposits | 153 | 190
Other current assets | 140 | 81
Total prepaid expenses and other | $ 1,289 | $ 1,891

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