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Balance Sheet Components - Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 53,273 $ 49,963
Work-in-progress 22,303 19,998
Finished goods 56,900 20,299
Inventory, net $ 132,476 $ 90,260