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Accrued liabilities (Tables)
3 Months Ended
Mar. 31, 2020
Accrued liabilities [Abstract]  
Accrued Liabilities
As of March 31, 2020 and December 31, 2019 accrued liabilities consisted of the following:

  
March 31,
2020
  
December 31,
2019
 
Accrued construction costs
 
$
21,777
  
$
25,037
 
Accrued interest
  
13,828
   
-
 
Accrued bonuses
  
3,462
   
14,991
 
Other accrued expenses
  
29,462
   
14,915
 
Total accrued liabilities
 
$
68,529
  
$
54,943