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Balance Sheet Details - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Details [Abstract]    
Materials $ 38,280 $ 32,993
Work-in-process 21,609 18,764
Finished goods 5,877 13,728
Total inventories $ 65,766 $ 65,485