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Property and equipment, net (Tables)
12 Months Ended
Dec. 31, 2014
Property And Equipment Net Tables  
Components of Property, Plant and Equipment

Property and equipment consists of the following:

            December 31,
            2014     2013
Production equipment         $ 3,078,000    $ 2,943,000 
Leasehold improvements           494,000      502,000 
Computer hardware and software/lab equipment           4,486,000      4,373,000 
Office furniture and equipment           1,087,000      1,100,000 
            9,145,000      8,918,000 
Less: Accumulated depreciation           (8,251,000)     (7,853,000)
          $ 894,000    $ 1,065,000