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Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Prepaid insurance | $ 126 | $ 140
Prepaid expenses | 233 | 133
Prepaid rent | 80 | 70
Restricted cash | 342 | 0
Other | 1 | 10
Total prepaid and other current assets | $ 782 | $ 353

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