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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
Summary of Accrued Liabilities

    Years ended December 31,  
    2019     2018  
    (in thousands)  
             
Employee-related liabilities   $ 187     $ 67  
Amounts due to certain government institution     -       220  
Other current liabilities     608       468  
    $ 795     $ 755