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Prepaid Expenses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expenses |  |
Prepaid corporate insurance | $ 158 | $ 53
Prepaid software services and support | 281 | 20
Prepaid employee insurance premiums | 78 | 71
Prepaid Nassdaq listing fee | 15 | 0
Other prepaid expenses | 118 | 46
Total prepaid assets | $ 650 | $ 190

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