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Property, Plant and Equipment, net (Tables)
9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
        
   September 30,
2021
   December 31,
2020
 
Land  $1,565   $1,565 
Buildings and improvements   18,082    17,834 
Machinery and equipment   31,959    31,707 
Vehicles   778    778 
Office equipment   895    857 
Construction in process   399    228 
    53,678    52,969 
Less accumulated depreciation   (33,132)   (31,921)
Total property, plant and equipment, net  $20,546   $21,048