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Balance Sheet Components - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 9,504 $ 279
Work in process 49,307 14,395
Finished goods 1,386 2,844
Total inventories 60,197 17,518
Inventories 4,101 7,873
Inventories, noncurrent portion $ 56,096 $ 9,645