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3. Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
      As of        
   

March 31,

2020  

    

December 31,

2019  

  
Land   $ 4,077     $ 4,104  
Plant and buildings     83,799       83,139  
Furniture and fixtures     1,095       1,094  
Machinery and equipment     4,169       4,252  
Construction in progress     19,206       12,571  

 

Property held for development

 

     15,408       15,408  

 

Total gross property, plant & equipment

 

     127,754       120,568  

 

Less accumulated depreciation

 

     (37,126 )     (36,342 )
Total net property, plant & equipment   $ 90,628     $ 84,226  
Depreciation of property, plant, and equipment
    Years  
Plant and buildings     20 - 30  
Machinery & equipment     5 - 7  
Furniture & fixtures     3 - 5