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Balance Sheet Components - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 7,364 $ 9,504
Work in process 64,678 49,307
Finished goods 1,973 1,386
Total inventories 74,015 60,197
Inventories 3,576 4,101
Inventories, noncurrent portion $ 70,439 $ 56,096