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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment

Property and equipment consists of the following:

 

    Estimated
Useful Life
(in years)
  As of December 31,  
        2017      2016  
Cost:                
Computer hardware and software   3 - 5   $ 55     $ 78  
Equipment   7     145       218  
Leasehold improvements   Term of lease     339       339  
          539       635  
Accumulated depreciation and amortization                    
Computer hardware and software         55       61  
Equipment         96       159  
Leasehold improvements         249       201  
          400       421  
Property and equipment, net       $ 139     $ 214