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Balance Sheet Components - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and work-in-progress $ 22,866 $ 16,324
Finished goods 5,145 2,917
Less: reserves (604) (399)
Inventories $ 27,407 $ 18,842