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Balance Sheet Components - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 26,119 $ 12,721
Work in process 13,784 12,157
Finished goods 15,738 6,810
Inventories $ 55,641 $ 31,688