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Accrued Expenses (Tables)
 6 Months Ended
Jun. 30, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Expenses

Accrued expenses consist of the following:

 

           
   (in thousands) 
   June 30, 2021   December 31, 2020 
Compensation  $16   $2 
Professional fees   180    124 
Other expenses   177    316 
Accrued expenses  $373   $442