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Property, Plant and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
   

March 31,

2018

   

December 31,

2017

 
Manufacturing equipment   $ 10,038     $ 9,660  
Office equipment     493       463  
Transportation equipment     211       203  
Leasehold improvement     289       277  
Total cost     11,031       10,603  
Less: Total accumulated depreciation     (8,673 )     (8,263 )
Construction in progress     373        
Total property, plant and equipment, net   $ 2,731     $ 2,340