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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Balance Sheet Components [Abstract]    
Purchased materials $ 7,988 $ 6,222
Work in process 4,899 7,341
Finished goods 4,517 4,315
Inventory $ 17,404 $ 17,878