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4. Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

 

    December 31,  
    2019     2018  
Leasehold improvements   $ 732     $ 542  
Machinery and equipment     12,430       10,224  
Less accumulated depreciation and amortization     (9,198 )     (8,037 )
Property, plant and equipment, net   $ 3,964     $ 2,729  

 

Depreciation and amortization expense relating to property, plant and equipment for the years ended December 31, 2019 and 2018 was approximately $1,219 and $868, respectively.