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Balance Sheet Components - Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid insurance and other $ 1,920 $ 5,326
Vendor prepayments 2,703 4,132
Total $ 4,623 $ 9,458