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4. Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

 

    December 31,  
    2018     2017  
Leasehold improvements   $ 542     $ 422  
Machinery and equipment     10,224       8,970  
Less accumulated depreciation and amortization     (8,037 )     (7,191 )
Property, plant and equipment, net   $ 2,729     $ 2,201  

 

Depreciation and amortization expense relating to property, plant and equipment for the years ended December 31, 2018 and 2017 was approximately $868 and $808, respectively.