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Balance Sheet Components - Inventories (Details) - USD ($)
$ in Thousands
Jun. 29, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 1,973 $ 2,881
Work-in-process 755 933
Finished goods 8,871 10,130
Service-related spares 11,395 12,032
Inventory, Net $ 22,994 $ 25,976