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Balance Sheet Components - Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 2,297 $ 2,232
Work-in-process 1,210 879
Finished goods 4,596 4,711
Total $ 8,103 $ 7,822