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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid expenses $ 764 $ 1,620
Notes receivable — current 232 0
Deposits 153 190
Other current assets 140 81
Total prepaid expenses and other $ 1,289 $ 1,891