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Balance Sheet Components (Components Of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Balance Sheet Components [Abstract]    
Purchased materials $ 7,042 $ 4,817
Work in process 7,040 7,287
Finished goods 4,119 3,530
Inventory $ 18,201 $ 15,634