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Balance Sheet Components (Components of Inventory) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Balance Sheet Components [Abstract]    
Purchased materials $ 11,530 $ 7,993
Work in process 9,202 8,611
Finished goods 8,893 7,995
Inventory $ 29,625 $ 24,599