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BALANCE SHEET COMPONENTS - Schedule of inventory, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Raw materials $ 747 $ 772  
Finished goods 53 99  
Total inventory 800 871  
Reserve for obsolescence (5) (18) $ (29)
Inventory, net $ 795 $ 853