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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Balance Sheet Components [Abstract]    
Purchased materials $ 5,198 $ 3,966
Work in process 5,439 4,594
Finished goods 5,303 4,752
Inventory $ 15,940 $ 13,312