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Balance Sheet Details - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw material $ 2,083 $ 3,175
Work in process 4,045 1,685
Finished goods 1,851 1,481
Inventory $ 7,979 $ 6,341