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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expense And Other Assets Current [Abstract] |  |
Unbilled contract assets | $ 15,003 | $ 2,147
Deferred revenues from associated contracts | (7,003) | (2,147)
Net unbilled contract assets | 8,000 | 0
Prepaid assets | 6,598 | 8,353
Other current assets | 7,090 | 1,807
Total prepaid expenses and other current assets | $ 21,688 | $ 10,160

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