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Equipment and Leasehold Improvements (Tables)
 12 Months Ended
Dec. 31, 2013
Property Plant And Equipment [Abstract]  
Components of Equipment and Leasehold Improvements

Equipment and leasehold improvements consist of the following:

 

     As of December 31,  
     2013     2012  

Machinery and equipment

    $ 13,737      $ 13,559   

Office equipment

      752        731   

Office furniture

      110        108   

Leasehold improvements

      4,749        4,749   

Construction in progress

      45        25   
  

 

 

    

 

 

  
     19,393        19,172   

Less: Accumulated depreciation and amortization

      (16,929 )      (16,144 ) 
  

 

 

    

 

 

  
   $ 2,464      $ 3,028