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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid expenses $ 2,886 $ 1,869
Prepaid insurance 820 2,305
VAT and other receivable 25 362
Other current assets 0 347
Total prepaid expenses and other current assets $ 3,731 $ 4,883