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Balance Sheet Components - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Investments [Abstract]    
Raw materials $ 820 $ 2,303
Work-in-progress 20,662 8,114
Finished goods 7,833 6,113
Total inventories $ 29,315 $ 16,530