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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