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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Balance Sheet Components [Abstract]    
Purchased materials $ 4,458 $ 3,531
Work in process 6,862 6,651
Finished goods 4,948 4,048
Inventory $ 16,268 $ 14,230