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Equipment and Leasehold Improvements (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of equipment and leasehold improvements

    December 31,  
    2018     2017  
Equipment   $ 36,465     $ 37,074  
Leasehold improvements     1,639       1,639  
      38,104       38,713  
Less accumulated depreciation and amortization     28,265       28,383  
    $ 9,839     $ 10,330