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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Prepaid Expense And Other Assets Current [Abstract] |  |
Unbilled contract assets | $ 2,147 | $ 180,000
Deferred revenues from associated contracts | (2,147) | (54,790)
Net unbilled contract assets | 0 | 125,210
Prepaid assets | 8,353 | 6,464
Other current assets | 1,807 | 1,717
Total prepaid expenses and other current assets | $ 10,160 | $ 133,391

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