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4. Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2018
Property Plant And Equipment Net  
Schedule of Property, Plant, and Equipment
    December 31,  
    2018     2017  
Leasehold improvements   $ 542     $ 422  
Machinery and equipment     10,224       8,970  
Less accumulated depreciation and amortization     (8,037 )     (7,191 )
Property, plant and equipment, net   $ 2,729     $ 2,201