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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Payables and Accruals [Abstract]  
Summary of Accrued Liabilities

    As of December 31,  
    2017     2016  
    (in thousands)  
             
Employees   $ 64     $ 102  
Government institution     56       24  
Other current liabilities     330       145  
    $ 450     $ 271