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Fixed Assets, Net (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Summary of Fixed Assets, Net

    Years ended December 31,  
    2019     2018  
    (in thousands)  
             
Cost:                
Research equipment and software   $ 52     $ 98  
Leasehold improvement     161       83  
Furniture and office equipment     160       210  
    $ 373     $ 391  
Accumulated Depreciation:                
Research equipment and software     38       47  
Leasehold improvement     4       12  
Furniture and office equipment     103       73  
      145       132  
                 
Net book value   $ 228     $ 259