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Balance Sheet Components - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 13,716 $ 279
Work in process 21,118 14,395
Finished goods 819 2,844
Total inventories 35,653 17,518
Inventories 2,357 7,873
Inventories, noncurrent portion $ 33,296 $ 9,645