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4. Property, Plant and Equipment, net (Tables)
 12 Months Ended
Dec. 31, 2015
Property Plant And Equipment Net Tables  
Schedule of Property, Plant, and Equipment
    December 31,  
    2015     2014  
             
Leasehold improvements   $ 369     $ 370  
Machinery and equipment     7,184       6,214  
Less accumulated depreciation and amortization     (5,713 )     (5,302 )
Property, plant and equipment, net   $ 1,840     $ 1,282