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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

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