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4. Property, Plant and Equipment, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property Plant And Equipment Net Details    
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