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Balance Sheet Components - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Schedule Of Investments [Abstract]    
Raw materials $ 1,152 $ 325
Work-in-progress 5,616 2,264
Finished goods 5,034 4,298
Total inventories $ 11,803 $ 6,887