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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,  
          2018     2017  
Cost:                        
Computer hardware and software     3 - 5     $ 55     $ 55  
Equipment     7       145       145  
Leasehold improvements     Term of lease       339       339  
              539       539  
Accumulated depreciation and amortization                        
Computer hardware and software             55       55  
Equipment             120       96  
Leasehold improvements             291       249  
              466       400  
Property and equipment, net           $ 73     $ 139