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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid Expenses and Other Current Assets    
Prepaid Insurance $ 1,265 $ 36
Vendor prepayments and deposits 963 2,009
Prepaid rent 879 394
Non-trade receivables 242 282
Interest receivables and other current assets 153  
Total prepaid expenses and other current assets $ 3,502 $ 2,721