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BALANCE SHEET COMPONENTS - Schedule of inventory, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Raw materials $ 729   $ 772      
Finished goods 54   99      
Total inventory 783   871      
Less: reserve for obsolescence (18) $ (18) (18) $ (22) $ (26) $ (29)
Inventory, net $ 765   $ 853