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Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2013
Property and Equipment, Net  
Schedule of components of property and equipment
 
   Year ended
December 31,		  
 
   2013   2012  

Equipment

   $ 4,868   $ 5,151  

Furniture and fixtures

     227     227  

Leasehold improvements

     2,652     2,641  

Software

     381     381  
           
​ ​ ​ ​ ​ ​ ​ ​

Total property and equipment, at cost

     8,128     8,400  

Less: Accumulated depreciation

     (7,335 )   (7,042 )
           
​ ​ ​ ​ ​ ​ ​ ​

Property and equipment, net

   $ 793   $ 1,358  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​