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Selected Balance Sheet Components - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract]    
Prepaid insurance $ 1,342 $ 264
Prepaid vendors, deposits and service agreements 977 646
Other 8 295
Total prepaid expenses and other current assets $ 2,327 $ 1,205