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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Components of Property and Equipment
    December 31,  
    2018       2017  
Computer equipment and software   $ 7,143     $ 6,935  
Furniture and office equipment     142       142  
Leasehold improvements     348       348  
Construction in progress            
      7,633       7,425  
Accumulated depreciation     (6,930 )     (6,292  
    $ 703     $ 1,133