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4. Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2017
Property Plant And Equipment Net Tables  
Schedule of Property, Plant, and Equipment
    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