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4. Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

 

    December 31,  
    2017     2016  
Leasehold improvements   $ 422     $ 392  
Machinery and equipment     8,970       8,548  
Less accumulated depreciation and amortization     (7,191 )     (6,454 )
Property, plant and equipment, net   $ 2,201     $ 2,486  

 

Depreciation and amortization expense relating to property, plant and equipment for the years ended December 31, 2017 and 2016 was approximately $808 and $748, respectively.