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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Balance Sheet Components [Abstract]    
Purchased materials $ 5,193 $ 6,222
Work in process 3,874 7,341
Finished goods 6,000 4,315
Inventory $ 15,067 $ 17,878