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BALANCE SHEET COMPONENTS - Schedule of prepaid expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Professional services $ 107 $ 41
Insurance 97 61
Software licenses 94 157
Other 14 6
Patents 10 39
Marketing programs and conferences 8 74
Prepaid expenses $ 330 $ 378