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3. Property, Plant and Equipment (Tables)
 3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
    As of  
   

March 31,

2021

    

December 31,

2020

  
Land   $ 4,091     $ 4,092  
Plant and buildings     97,249       97,398  
Furniture and fixtures     1,191       1,195  
Machinery and equipment     5,272       5,188  
Construction in progress     30,032       25,397  
Property held for development     15,408       15,408  
Finance lease right of use assets     2,308       2,308  
Total gross property, plant & equipment     155,551       150,986  
Less accumulated depreciation     (42,461 )     (41,106 )
Total net property, plant & equipment   $ 113,090     $ 109,880  
Depreciation of property, plant, and equipment
  Years
Plant and buildings   20 - 30
Machinery and equipment   5 - 15
Furniture and fixtures   3 - 5