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Other Financial Statement Information - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Other Financial Statement Information [Abstract] |  |
Prepaid insurance | $ 1,837 | $ 27
Prepaid contract costs | 889 |
Deposits | 57 | 86
Receivables on exercise of options |  | 52
Other | 786 | 392
Prepaid expenses and other current assets | $ 3,569 | $ 557

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