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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Prepaid Expense And Other Assets Current [Abstract] |  |
Unbilled contract assets | $ 66,909 | $ 2,147
Deferred revenues from associated contracts | (58,909) | (2,147)
Net unbilled contract assets | 8,000 | 0
Prepaid assets | 7,383 | 8,353
Other current assets | 5,070 | 1,807
Total prepaid expenses and other current assets | $ 20,453 | $ 10,160

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