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Accounts Payable and Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2019
Accounts Payable and Accrued Expenses [Abstract]  
Accounts Payable and Accrued Expenses
At June 30, 2019 and December 31, 2018, the Company’s accounts payable and accrued expenses consisted of the following:

  
June 30,
2019
  
December 31,
2018
 
Research and development
 
$
9,439
  
$
10,414
 
Construction in progress
  
788
   
-
 
Government grant payable
  
548
   
534
 
Professional fees
  
665
   
690
 
Accrued interest
  
1,241
   
1,241
 
Bonus
  
1,021
   
1,774
 
Other
  
234
   
589
 
Accrued vacation
  
232
   
130
 
  
$
14,168
  
$
15,372