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Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expense And Other Assets Current [Abstract] |  |
Unbilled contract assets | $ 5,256 | $ 2,147
Deferred revenues from associated contracts | (5,256) | (2,147)
Net unbilled contract assets | 0 | 0
Prepaid assets | 7,149 | 8,353
Other current assets | 1,309 | 1,807
Total prepaid expenses and other current assets | $ 8,458 | $ 10,160

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