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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Balance Sheet Components [Abstract]    
Purchased materials $ 5,253 $ 3,531
Work in process 9,050 6,651
Finished goods 3,682 4,048
Inventory $ 17,985 $ 14,230