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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Prepaid Expense And Other Assets Current [Abstract] |  |
Unbilled contract assets | $ 180,000 | $ 0
Deferred revenues from associated contracts | (54,790) | 0
Net unbilled contract assets | 125,210 | 0
Prepaid assets | 6,464 | 2,705
Other current assets | 1,717 | 2,224
Total prepaid expenses and other current assets | $ 133,391 | $ 4,929

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