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Accrued Expenses and Other Current Liabilities – As Restated (Tables)
12 Months Ended
Dec. 31, 2020
Accrued Liabilities and Other Liabilities [Abstract]  
Schedule of accrued expenses and other current liabilities
   December 31, 
   2020 as restated   2019 
   (in thousands) 
Accrued professional services  $1,032   $120 
Accrued compensation and related benefits   615    - 
Refundable grant   175    175 
Accrued liability for warrants exercised but not settled   4,282    - 
Other accrued liabilities   160    205 
           
   $6,264   $500