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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Balance Sheet Components [Abstract]    
Purchased materials $ 6,253 $ 6,222
Work in process 9,104 7,341
Finished goods 4,293 4,315
Inventory $ 19,650 $ 17,878