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4. Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
4. Property, Plant and Equipment, net

Property, plant and equipment, net include the following:

 

    December 31,  
    2014     2013  
             
Leasehold improvements   $ 370     $ 322  
Machinery and equipment     6,214       5,576  
Less accumulated depreciation and amortization     (5,302 )     (4,853 )
Property, plant and equipment, net   $ 1,282     $ 1,045  

 

Depreciation and amortization expense relating to property, plant, and equipment for the years ended December 31, 2014 and 2013 was $460 and $406, respectively.