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Balance Sheet Components - Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 2,232 $ 1,721
Work-in-process 879 1,487
Finished goods 4,711 3,701
Inventory $ 7,822 $ 6,909