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Balance Sheet Details - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Prepaid Expense And Other Assets Current [Abstract] |  |
Prepaid expenses | $ 1,421 | $ 60
Security deposits | 104 | 47
Interest receivable | 47 | 10
Other |  | 25
Total | $ 1,572 | $ 142

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