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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Components [Abstract]    
Purchased materials $ 6,222 $ 8,884
Work in process 7,341 9,994
Finished goods 4,315 4,187
Inventory $ 17,878 $ 23,065