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Balance Sheet Components - Schedule of Inventory (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule Of Investments [Abstract] |  |
Raw materials | $ 2,303 | $ 325
Work-in-progress | 8,114 | 2,264
Finished goods | 6,113 | 4,298
Total inventories | $ 16,530 | $ 6,887

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