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

Equipment and leasehold improvements consist of the following:

 

    As of December 31,  
    2018     2017  
Machinery and equipment   $ 15,513     $ 14,936  
Office equipment     840       811  
Office furniture     110       110  
Leasehold improvements     4,839       4,839  
Construction in progress     97       157  
      21,399       20,853  
Less: Accumulated depreciation and amortization     (19,534 )     (19,229 )
    $ 1,865     $ 1,624