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Equipment and Leasehold Improvements
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Equipment and Leasehold Improvements
(7) 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  

  

Depreciation and amortization expense was $4.1 million, $3.8 million and $3.7 million in 2018, 2017, and 2016, respectively.