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Balance Sheet Components (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Balance Sheet Components [Abstract]    
Product transition costs $ 2,400  
Purchased materials 7,557 $ 8,884
Work in process 7,367 9,994
Finished goods 4,770 4,187
Inventory $ 19,694 $ 23,065